Compact behind the ear design. 50dB of power. Amplifies sound up to 9 times your normal hearing. AFT-adjustable frequency tuning provides bass and treble fine tuning capability. Four digital sound processing channels. 20-bit audio processor. Three push button program settings: Communication, enhancement and communication/enhancement combined. Eliminates amplification for any sudden or sustained sound over 100 decibels. Foam ear plugs provide a noise reduction rating of 29 dB PTT Mic Comm loop allows for 2-way communication when used with compatible FRS & GMRS hand held radios. Water repellent. Includes Walker's tip variety pack, elbow, silicon tips, foam tips, AFT screwdriver, carrying pouch, #13 air cell batteries and instruction sheet. Hang packaged.