Bluetooth 4.0 Receiver A2DP Wireless Adapter for Home Audio Music Streaming Sound System with 3.5 mm Stereo Output for Car, Home Stereo, iPhone, Samsung, Android, Headphone &Speakers(Black) Double Link: Connect two Bluetooth devices simultaneously. It will automatically connect to the last Bluetooth device when it turns on. Various Functions: Answer/End/Reject/Redial a call, play/pause music, adjust volume. It can switch music and calling which makes your driving safely and provide you super clear conversation effect. An ideal choice for vehicle mounted systems. Wide Compatibility: Compatible with most smartphones and Bluetooth electronics through A2DP; ideal for home or vehicle audio systems using standard RCA or 3.5mm Jack. Sound Quality: It can isolate other nearby wireless signal and guarantee you can enjoy high quality stereo audio through Bluetooth electronics. Built-in microphone picks up your voice with clarity so you can chat without problems Warranty Policy: Every Bluetooth receiver you ordered from J&L Shop can enjoy a free replacement or full refund within 12 months. If you have any questions or problems, don't hesitate to contact us!