Grace Digital GDI-BTTV100 Wireless TV Speaker with Digital Voice Enhancing Equalization to Optimize TV Audio Dialog Featuring two 3" full-range speakers ported bass system for crisp, clear sound, built-in 16-watt class D digital amplifier drives the speakers to get the most out of Television, music, and movies. 16 watts class D digital amplifier, Frequency response: 60Hz - 18KHz +/-3dB, Signal-to-Noise Ratio: 89dB Product Dimensions: 13 x 3.8 x 4.3 inches ; Weighs: 4 pounds Top mounted panel buttons , 7.4V /2200mAh Lithium Ion battery - The optional rechargeable battery will play the Voice Enhanced TV Speaker for approximately 7 hours (actual times vary) What's in the Box: BTTV speaker, manual, power adapter for transmitter, power adapter for speaker, remote control, digital audio cable, analog audio cable. Not included: optional battery for the speaker. Please refer the User Manual before use.