Bluetooth 5.0 Chip design, pairing two devices at a time. Built-in microphone. You can connect to your smartphone to enjoy wireless high-quality stereo music and hands-free calling. Intelligent noise reduction. Up to 33 feet of connection range. Pen-clip design, Easy to carry, easy to answer calls during fitness or exercise, Enjoy wireless happiness.You can play/pause/skip music/answer a call/redial the last caller number or control the music on the receiver. Built-in rechargeable battery, providing up to 3 hours of playback and talk time, charging can be completed in about 1.5 hours. Connect to this Bluetooth receiver via a 3.5mm audio cable/adapter, then pair your phone for easy listening/navigation or answering calls.This mini Bluetooth receiver can connect two Bluetooth devices at the same time. Built-in microphone for hands-free calling while driving. Designed with independent volume “+/-” buttons for perfect control of voice up/down and play/pause. 2-in-1 Bluetooth Assist Adapter Support > 3 hours of continuous wireless audio playback time, automatically re-pairing with the last paired device