Fangrui Product Details Bluetooth Everywhereby Connecting The Transceiver To Non-bluetooth Devices, Realize Wireless Connection With Various Bluetooth Devices. And Achieve A Connection Range Of Up To 50 Feet (15m) Outdoors And Up To 33 Feet (10m) Indoors. Transmitter Receiver All In 1transmitter Mode: Transmit Audio From Non-bluetooth Audio Sources (tv, Pc, Cd/dvd Player, Etc.) To Bluetooth Headphones Or Speakers. Receive Mode: Wirelessly Transmit Audio From Bluetooth Sources Such As Smartphones To Non-bluetooth Headphones/speakers/car Audio Systems. Upgraded Pc Transmitter Modeplug The Bluetooth Transmitter Into A Non-bluetooth Computer With A Usb Charging Cable To Make It Bluetooth Enabled. No Need For 3.5mm Audio Cables/drivers. When The Computer Is Turned Off, It Can Still Power The Transmitter And Keep It Connected. Long Battery Lifethe Built-in 300mah Rechargeable Battery Can Provide You About 7 Hours In Transmitter Mode And 10 Hours In Receiver Mode After Fully Charged For 1 Hour.