Connect this telephone amplifier to your business phone for loud and clear calls that are amplified up to 170 times louder on your handset or headset- Includes the H141N DuoSet Noise-Canceling Headset and RJ9 adapter-Features- Amplifies incoming voices up to 45dB on your handset or headset- Can be used with any headset with an RJ9 plug- Patented technology enables the amplifier to work with virtually all business telephones- Digital Sound Processing technology eliminates virtually all distortion, echo effects and unwanted static- Digital Tone Enhancement allows you to boost and enrich the speech frequencies you cant hear well- Automatic Gain Control optimizes the sound level for superior listening comfort- Automatic Volume Control- AC adapter included 9V battery optional- Item Weight - 3 lbs- SKU: HRSC1575