Sonetics Headphones

Powered by the latest DECT7 wireless technology, the APX377 connects you to team members in full-duplex conversation, just like a conference call.

Download the APX377 Product Sheet
Download the APX377 Manual
Download the NRR Overhead Certification
Download the NRR Behind Head Certification


Powered by the latest DECT7 wireless technology, the APX377 connects you to team members in full-duplex conversation, just like a conference call. No delays, no buttons to push and no clipping or interference. Multi-channel capability lets multiple teams operate simultaneously in the same work area. Push-to-talk or monitor virtually any portable two-way radio via a direct-wire cable connection (wired portable radio adapter required, radio not included). Noise canceling and auto-leveling microphones ensure you are heard clearly as you move from low- to high-noise areas. Stereo Listen-Through situational awareness lets you hear your surroundings and have face-to-face conversations while protected from dangerous noise levels. Watertight and verified and validated to perform in extreme environments, the APX377 protects your hearing while you get the job done.

ADVANCED HEARING PROTECTION WITHOUT ISOLATION Stereo Listen-Through – We have found the most common issue with hearing protection is the isolation users feel when wearing them. We added Stereo Listen-Through to all of our Apex 3-Series headsets for critical situational awareness.

20dB NRR – With 20dB of certified NRR protection, our headsets are ready to go where you need to be.

Personal Sound Dosimeter – Hearing protection is nothing if it’s just a guess. This is why we added a personal sound dosimeter to every Apex 3-Series headset. Know you are wearing the headset correctly and have the protection.

Active Sound Management – We manage sounds from all communication sources to ensure optimal clarity and protection. This is done with the noise canceling and auto-leveling microphone, automatic loud noise suppression, and personal sound dosimeter with automatic input gain adjustments.

RUGGED We know your job may take you anywhere, so we designed our headset to go anywhere you do.

  • Marine – Sealed against salt spray and moisture.
  • Winter – Operation down to -22°F (-30°C).
  • Summer – Operation up to 158°F (70°C).
  • Accident – Drop tested to 13 feet (4m).
  • Cleanliness – Easy to clean surfaces.

COLOR YOUR TEAM Silicone Ruggedizers – Know at a glance who is who on the job. Define teams, roles, communication profiles or individuals. Adds extra impact protection and abrasion resistance.

SUPERIOR DECT7 TECHNOLOGY Our DECT7 wireless communication technology was created from years of experience in the field in the harshest environments. To find out more about DECT and it’s benefits:

adjustable volume controlAdjustable Volume Control – Programmable and real-time adjustable user volume control. Returns to the last setting at power-up.
auto leveling microphoneAuto-Leveling Microphone – Automatically detects your voice against background noise, enabling an automatic VOX (noise gate or squelch) that needs no adjustment when transitioning between areas of different noise levels.
automatic loud noise suppressoinAutomatic Loud Noise Suppression – Limits high impulse sounds such as gunshots when using the Stereo Listen-Through feature.
convertible headbandConvertible Headband – User-configurable for overhead, behind-head, or hard hat (with hard hat accessory). Change the way you wear your headset from one job to the next.
color ruggedizerSilicone Ruggedizers – Define teams or roles, and enhance safety. Adds additional abrasion and impact protection. Available in many standard and custom colors (sold separately).
extreme environmental designExtreme Environmental Design – With an IP-66 dust and water ingress protection rating, Apex 3-Series headsets continue working even when hit with a fire hose, worn in a downpour or left out in the dust and sun of a job site. Verified operation to -22°F (-30°C) for extreme cold weather environments.
hearing protectionHearing Protection – Conforms to many of the required hearing protection standards protecting the user from harmful noise.
in headset chargingIn-Headset Charging – Charge from multiple sources, including the supplied AC wall adapter. DC charging from most cars, trucks, and aircraft. Refer to specifications for charging voltages and power requirements.
lightweightLight Weight – Use of the latest weight saving technologies delivers a wireless headset that is lighter than many wired communication headsets.
listen through situational awarenessListen-Through Situational Awareness – Stereo Listen-Through microphones give the wearer full situational awareness. Microphones placed on the forward edge of each ear dome provide the perception of sounds in the front versus from the rear. The Listen-Through feature has an independently adjustable volume level and automatically limits all sounds to a maximum of 82dB.
long battery life 24hrLong Battery Life – Over 24 hours of battery life on DECT7 headsets, means they are ready to work whenever you need them.
multilingual voice promptsMultilingual Voice Prompts – Hear voice prompts in your preferred language. Ships with American English installed. Spanish available as a factory-installed option.
multimode auto shutdownMultimode Auto Shutdown – Extends battery life. All shutdown timers have a voice prompt announcement and may be cancelled by pressing any button.
noise cancelling microphoneNoise Cancelling Microphone – Lets you hear the person talking by removing distracting background noise at the microphone.
personal sound dosimiterPersonal Sound Dosimeter – Measures and records sound levels inside the ear cup cavity over a period of up to 24 hours to ensure compliance with noise exposure limits. Remembers the Time Weighted Average even when turned off (memory will reset after being turned off for 6 hours), and will average the last 24 hours continuously. Programmable audible alerts send a voice prompt to the user notifying them of the last 24 hours of exposure. The system automatically adjusts inputs (Listen-Through, AUX, Bluetooth, and sidetone) to ensure compliance with hearing protection standards. For reference use only.
radio pttRadio PTT – The headset interfaces with any two-way portable radio using the wired AUX input or wireless DECT7 connection. When there is a wireless DECT7 connection, PTT signals pass to the DECT7 Wireless Base Station and then to the Digital Intercom. If no DECT7 connects is available, PTT signals pass to the wired AUX input.
two stage low battery alertTwo Stage Low Battery Alert – Audible alerts sound at 25-50% remaining battery level, and again at less than 25%.
usb programableUSB Programmable – Use the integrated USB port to configure your headset with a Windows PC. Many features may be customized and saved from the program. Refer to the Sonetics Headset Program for details.
user replaceable batteryUser Replaceable Battery – Replace the battery at end-of-life. Maintain a spares pool for extended operating time.
voice promptsVoice Prompts – Change any setting without removing your headset. No need to look for lights, text, or knob positions. Voice prompts automatically adjust the volume to ensure intelligibility in changing environments.
wired line inWired Line-in – Connect to cell phones, handheld radios, and other mobile devices. The wired connection features a mono input. See your Sonetics dealer for accessories to match your equipment.
dect7Wireless DECT7 Communications – Full duplex, conference call-like communication with others on the same channel. Connects with a DECT7 Wireless Base Stations or an IP-DECT7 wireless system. Provides up to 1,600 ft. line-of-sight range to the wireless base. The standard further ensures interference-free and digitally encrypted communications among all parties.
dectWireless DECT Backwards Compatibility – The wireless headset is backward compatible with the Sonetics first generation wireless DECT and DECT6 Wireless Base Stations with minimal loss in functionality.
dect 7 broadcast modeWireless DECT7 Broadcast Mode – The headset may be paired into a listen-only mode of operation, reducing power consumption considerably. This also allows many more headsets to be connected to a Wireless Base Station simultaneously. Pressing the Radio PTT button allows the headset to momentarily talk on any available open slot. A tone will let the user know when they can talk. Refer to the Wireless DECT7 Base Station manual for details.
dect7 dual dome antenna designWireless DECT7 Dual Dome Antenna Design – Each dome has a separate DECT7 antenna using diversity switching to lock onto the best signal. This means the user doesn’t need to worry about head position relative to the wireless base and the best possible connection is delivered at all times.
dect7 encryptionWireless DECT7 Encryption – using the latest digital encryption available, the DECT7 headsets ensure your conversations are private.
dect7 radio ptt or intercom only selectionWireless DECT7 Radio PTT or Intercom Only Selection – The headset may be configured to send a transmit signal to radios connected to the DECT7 Wireless Base Station and Intercom of a Sonetics DECT7 wireless communication system. This allows the user to transmit over multiple radios depending on the Wireless Base Stations and Intercom configuration. Additionally, the Headset may have radio transmit deselected. This is excellent for teams where some users will need radio transmit and others will not.
dect7 multi-channel systemWireless DECT7 Multi-Channel System – Depending on the wireless DECT7 Wireless Base Station or IP-DECT7 system, the user may have access to multiple channels. This allows large teams to have separate channels for different activities while enabling users to change channels and become one communication team. Refer to the Wireless Base Station manual for configuration.
dect7 out of range warningWireless DECT7 Out of Range Warning – The headset notifies the user via voice prompt when the wireless connection is weak, or when it appears to go out of range from the Wireless Base Station.
dect7proximity pairingWireless DECT7 Proximity Pairing – To enhance security, the Wireless Base Station will only pair to wireless DECT7 units in close proximity. This adds another layer of protection for users.
dect7 wide band audioWireless DECT7 Wide Band Audio – The wireless DECT7 communications are transmitted in a high definition wideband audio format. This allows greater intelligibility of the user and integration with voice-activated control systems. This feature is defeatable to allow the user to be in a narrow band audio communication.

Over Head: 15.8oz / 448g | 17.8oz / 504g with Ruggedizers
Behind Head: 16.2oz / 458g | 18.1oz / 514g with Ruggedizers

Battery: 3.7V rechargeable lithium ion
Battery Life: >24 hours @ 25°C
Protection: Over voltage, under voltage, over current, and over temperature protection
AC Charge source: Supplied 12VDC, 500mA wall charger
DC Charge source: 5VDC to 16VDC, 0.5A minimum
Charge Time: <4 hours for fully discharged battery

Operating temperature: -22°F to 140°F / -30°C to 60°C
Storage temperature: -4°F to 122°F / -20°C to 50°C
Charging Temperature: 32°F to 113°F / 0°C to 45°C
IP-Rating: IP-66 (Dust Tight, sealed against salt spray and moisture)

FCC Part 15
FCC ID APX377: V9N960325300V1
IC UPN APX377: 7895A-950325300

Conducted Transients: 7637-2
Quality Management System Control: ISO 9001:2008

Chemical Exposure: Intermittent Exposure MIL-STD 810 Method 504:
Isopropyl alcohol, Formula 409®, WD-40®, Windex®, Bleach/Water (1:1), Mineral oil, Synthetic Sweat, Jet A Fuel, Kerosene, Gasoline, Deicing (Ethylene or Propylene Glycol mixtures), Potassium-Acetate based solution, Ansulite.
Humidity: MIL-STD 810F and 810G
Temperature Shock: MIL-STD 810F and 810G

Behind Head NRR Rating: 20dB
Over Head NRR Rating: 20dB

Patents Pending

Conducted Immunity: J1113-11
Electrostatic Discharge: J1113-13
Radiated Emissions: CISPR 25
Radiated Immunity: ISO 11452-2
Salt Spray: J1455, Sec. 4.3
Vibration: J1455 Sec. 4.9

UL1642 Standard for Lithium Batteries

UN38.3 UN Transportation Testing for Lithium Batteries

Wireless DECT7
Common DECT Specifications
Carrier Spacing: 1.724 MHz
Time Slots: 2 x 12 (up and down stream)
Channel Allocation: Dynamic
Encryption: DECT Standard Cipher with 35-bit initialization vector
Audio Bandwidth: 300 Hz to 3.4 kHz, Narrow Band, G.726 compression
50 Hz to 7 kHz, Wide Band, G.722 compression
Region 1 Specific Specifications
Range (line of sight): 1600 feet maximum
Authorized for use in Canada and USA
Frequency Bandwidth: 1919.808 MHz to 1930.176 MHz
Number of Carriers: 5
Total Time Slots: 60 in G.726(narrow band) / 30 in G.722(wideband)
Average Output Power: 4 mW
Maximum Output Power: 100 mW