Bluetooth Wireless Adapter One Transmitter Could Connect with Two Bluetooth Devices At the Same Time(black) one transmitter could connect with two Bluetooth devices at the same time Bluetooth version:4.0 Valid distance: less than 10 meters Battery duration:5 hours Charging period:1.5 hours Product size: 45mm*11mm To help customers to realize a higher quality wireless household lives Easy operation, connect the product with audio players by a audio cable, without set up after the device turn on