Features: Delicately disc design， exquisite workmanship and mini size with lighter weight. Multi-function technique， one Bluetooth receiver can connect with two Bluetooth devices. High quality stereo transmission for a better music experience. Reverse control of the music play of connected Bluetooth devices. Safe driving design， it can be used as a Bluetooth carkit which with music play function. Specifications: Bluetooth version: Ver 4.0 Transmission distance: ＞10m Continuously working time: 5 hrs Charge time: 1.5 hrs Unit size：45mm*11mm Packing list: 1 x Bluetooth music receiver 1 x Mini USB Power Cable 1 x 3.5mm Audio Cable