Calrad's 40-BT3 Bluetooth wireless transmitter has a 3.5mm stereo input plug that can easily connect to portable audio device for wireless Bluetooth audio playback. Play music, media content from any device with a 3.5mm headphone jack up to 35ft., the distance may vary with surroundings. Listen to your audio in comfort without a wired connection. Includes USB charging cable, Works with USB power or by battery power. Works with Calrad's 40-BT2 receiver or any standalone stereo receiver that has Bluetooth built-in that supports the A2DP protocol.