XIANQI Product Description: Quantity: 1pcs Color: black ADVANCED Areson BLUETOOTH 4.1 PORTABLE RECEIVER:Built with Bluetooth 4.1/HFP/HSP/A2DP/AVRCP to smart your life that you can enjoy music and hands-free calling from your smartphone in premium-quality sound.Up to 33ft connection range guarantees low signal delay.Our Bluetooth Car Adapter is not only for car, it is also could connect with your wired headphones via 3.5mm audio cable/adapter to help you enjoy the wireless. DOUBLE LINKS WIDE COMPATIBILITY: This Mini Bluetooth Receiver can connect two Bluetooth devices at the same time.It also could compatible with most smartphones and Bluetooth electronics, best ideal for home or vehicle audio systems and wired headphones.Please do not attempt to connect the gadget to such as Bluetooth headphones or speakers, this is meaningless since the functions as a Bluetooth receiver for those devices without Bluetooth feature itself but desire to receive Bluetooth signal. AUTOMATICALLY RECONNECT: This bluetooth receiver doesn't turn on automatically, please long press the "Multifunction Button" about 3 seconds, when it turned on the blue light will flash, then connect it with your Bluetooth devices.The charging input voltage to the receiver do not over 5V and do not use fast charger for the consideration of safety and the serve life of product. MULTI-FUNCTIONAL EASY CONTROL: You can answer phone calls or control music on the receiver. Change volume, play/pause/skip music, answer calls, redial the last called number with ease.