COMPATIBILITY: Works with iPhone, iPod, iPad, Tablets, Other Smartphone, most speakers, TV, and radio, easily plugs into any powered PC speakers, Car & Home Stereo Soundsystem and A/V receivers using RCA or 3.5 mm jacks. ELEGANT DESIGN AND HIGH-QUALITY SOUND: Bluetooth Version 4.1. Compact, mini lightweight for portable use and its high-quality sound conversion effect makes you enjoy a great listening experience. AUTOMATICALLY CONNECTION: The Bluetooth Receiver will connect to the last connected phone automatically when it turns on. (Please make sure enable the blue tooth function of your phone before turn on the device) EASY CONNECTION AND HAND FREE: The Bluetooth Receiver can connect two blue tooth devices simultaneously, and switch phone to play music. Music and calling switch conveniently makes your driving safety. It will provide you super clear conversation effect with hand-free function of answering/Ending/ Reject/Redialing a call.