AUKEY Bluetooth Receiver V4.1 Wireless Audio Music Adapter A2DP with Hands-Free Calling and 3.5mm Stereo Jack for Home and Car Audio System Wireless Audio Stream: Bluetooth receiver allows you to wirelessly stream audio from your Bluetooth enabled devices to your existing wired home stereo systems, speakers, or headphones Double Links: Connect two bluetooth devices simultaneously; free to enjoy music or answer phone call from either of the two paired devices Hands-free Calling: No driver is required. Supports hands-free calling with built-in microphone, never miss calls again Long Operation Time: 13 hours of talk and play time, or up to 720 hours standby time with a single charge Package Contents: AUKEY BR-C1 Bluetooth Receiver, 3.5mm Audio Cable, 3.5mm to RCA Audio Cable, Micro-USB Cable, User Manual, 45-Day Money Back Guarantee and 24-Month Warranty Card