Powerful amplifier increases incoming sounds up to 100 times (40+dB) louder for extra loud and clear conversations. Adjustable tone control lets you customize the amplifier for optimum word clarity so you can understand similar sounding words. Has an audio jack for connection to a head set or cochlear implant. Offers 900 MHz technology for extended operating range and static-free transmissions. Automatically scans all available channels and selects the clearest one for your call. Advanced noise reduction technology filters out background noise and static for superior sound clarity.