Sennheiser RS120 On-Ear Wireless RF Headphones with Charging Dock Includes wireless headphones, wireless transmitter that acts as the headphone charging dock and two AAA NiMH rechargeable batteries.Connectivity Technology: Wireless Lightweight radio frequency (RF) wireless, on-ear headphones for use with TV and Hi-Fi Audio Interference-free reception through walls, ceilings and outdoors up to 300 feet. Frequency response : 22 - 19500 Hz Can be connected with additional compatible headphones (sold separately) for mutiple users. Item dimensions is 3.3 x 8.8 x 5.2 in inches 2-year limited warranty only when purchased from an authorized dealer. Compatible with set-top DVD & Blu-Ray players, DVR's, satellite receivers, a/v receivers, laptops, mac/PC, MP3 players, LCD, Plasma and standard televisions that feature RCA outputs (red and white outputs) and/or 1/8" and 1/4" headphone sockets Not compatible with Bluetooth technology. Please Note: Kindly refer the Instructional Video and the User manual before use which is highly essential Extends The Range Of Any Remote To Control A/V Devices Through Obstacles From Up To 120 Ft Away Detailed, Analytical Sound Reproduction With Strong Bass Response. Range of up to 100 metres (300 feet) Perfectly Suitable For All Types Of Modern Music & Tv Applications Receives Reception Through Walls, Ceilings & Outdoors