BOLS 3.5mm Portable Stereo Audio wireless Bluetooth audio Transmitter for TV, iPod, MP3/MP4,USB power supply Bluetooth Transmitter (not a Bluetooth receiver): Connect to audio output devices, such as TV, iPod, PC, Kindle Fire etc. Offer easy pairing with Bluetooth receivers such as Bluetooth stereo, headsets, headphones and speakers TV Transmitter: Connect the Bluetooth transmitter to your TV and enjoy exclusive late night shows, all without disturbing your loved ones while they sleep. transmission distance &gt;32ft Applicable scenario: bluetooth headset Bluetooth stereo MP3 TV computer DVD, etc power by usb no time limit ,The device is powered by USB and requires no special software or drivers,