ANKRY (Smart $ Portable) MINI USB Bluetooth 3.5mm Stereo Audio Music Receiver & Adapter for Home Stereo , Portable Speakers , Headphones , Car (AUX In) Music Sound Systems , & More 3.5mm Media Devices Transmission distance: up to 10 meters (about 32.8 feet),enjoy music freely anytime, anywhere without the bound of wire. Bluetooth version:V2.0 (2.4GHz-2.4835 GHz) and support A2DP Technology , fantastic sound quality and easy to pair and connect. The initial pass code of this device is 0000. Bluetooth Music Receiver: Make any stereo a Bluetooth sound system capable of wirelessly playing music from your mobile, iPhone, PC, MP3 player. Standard 3.5mm Audio Out: Compatible with any car stereo or speaker with 3.5mm audio socket