Features: Easy to use Bluetooth 4.1 technology, strong versatility Line input stereo A USB data cable is connected to the computer and enumerated into a USB sound card to launch Wireless transmission distance >= 10 meters Perfectly compatible with all Bluetooth audio receiver boards in this store The reserved serial communication port can be customized to realize the connection of the specified device name, specify the MAC address connection, search for the Bluetooth device name, MAC address, get the connection status, disconnect, etc., and configure the information to be powered of Specifications: Color:As picture Quantity:1PC Size:15*23.7*2.7mm Package Include:1PC Bluetooth Audio Module Board Note: 1.Please allow 0.1-0.3cm differences due to manual measurement, thanks. 2.Please understand because of the light irradiation or computer display difference, so I can't guarantee photos and real color is 100% the same.