System Features:* Convenient Cordless Design* Hearing Audio Amplifying System* Built-in BT for Call Answering* Effectively Reduces Background Noise* Noise-Cancelling and Voice Clarifying Technology* Tested to Provide a More Comfortable Listening Experience* ASC (Automatic Signal Control) Regulates and Balances Sound* Charging of Hearing Aid By Connecting to Receiver Dock Base* Audio Optical Input for Home Theater Connection* Built-In Battery* Universal Size Fits All Shapes and Sizes* Tone, Balance and Volume Control Adjustable* Built-in Microphone (Used for Telephone / Smartphone Calls)* Also Connects to Televisions, Computers, DVD Players, etc.* Receiver Inputs: 3.5mm Audio and Microphone Jacks* Power Saving Auto Power-OffBT Connectivity:* Allows Hands-Free Call Answering Ability* Simply Press the Button to Accept Calls* BT Version: 4.0* Cordless Range: 50'+ FeetWhat's in the Box:* Cordless Hearing Amplifier* Receiver Charging Dock Base* Wall Power Adapter + USB Charging Cord* Aux (3.5mm) / RCA Audio Connection Cords* Optical Fiber Cord* Wired Microphone Cord* Replacement Earbuds* Ear-Hanging LoopsTechnical Specs:* 2.4GHz Cordless Audio Transmission* Average Charging Time: About 3.5 Hours* Battery Type: -ion, 3.7V* Battery Life up to 18 Hours* Frequency Response 20Hz-20KHz* Transmission Rate: 2Mbps* Distortion: < 1.0%* S/N Ratio: 75dB* Power: 120V (DC 5V Adapter)* Receiver Base Size (L x W x H): 4.6" x 3.8" x 0.9"* Cordless Headset Size (L x W x H): 7.9" x 5.2" x 0.8"Item Dimensions: 5.12" x 0.71" x 7.88"Item Weight: 0.26lbs