ZOpid - 2.4 GHz Weather-Resistant Stereo Wireless Speakers with built-in Rechargeable Battery (Black) Weatherproof 2.4GHz stereo speakers and transmitter - 2.4GHz digital transmission RCA and 3.5mm stereo jack on transmitter to connect to all types of audio source (MP3/MP4, iPod, Audio Receivers, computer, etc..) Digital wireless transmission of stereo audio up to 150ft (outdoors) and 50-80ft (indoors w/ signal passing thru walls) Volume controls on transmitter and both speakers - Power/Charging status indicator LED inside speaker grill Two-way power for speakers (built-in rechargeable battery or A/C adapters) - A/C adapter or Car DC adapter for the transmitter