341580 Brand new and high quality. High-fidelity stereo， high acoustic fidelity sound. Better compatible with all Bluetooth stereo A2DP enabled devices， such as iPad， iPod， iPhone， Samsung Galaxy phones， Bluetooth phones， Bluetooth laptop， and so on. This Bluetooth adapter hooks into any 3.5mm plug and provides wireless connectivity for any music device. Look no further， get one now! Color: black Size: about 54 x 25 x 11mm Bluetooth version: Bluetooth V3.0 Bluetooth protocol: A2DP HSP HFP OPP OBEX DUN Frequency range: 2.4GHZ-2.4835GHZ Chip type: OVC 3960 with a call stereo chip Interface: standard 3.5MM audio interface， standard USB micro power supply Effective distance: 10 ~ 15 m Charging time: about 2 hours Working time: about 8 hours Built-in microphone， support for hands-free phone function Instructions: 1. Plug the receiver into the 3.5mm playback devices， such as speaker with AUX function. 2. Long press the receiver's power button for about 5 seconds until the red and blue lights quick flash alternately into pairing mode， search on your phone and pairing， after the connection is successful， the blue indicator light flashes once every 5 seconds. 3. At this time you can play your favorite songs. 1 x Bluetooth audio receiver 1 x 3.5mm audio plug 1 x USB cable In original package