ITEM NAME:2X(Mp3 Wireless Bluetooth 4.2 Audio Receiver Decoding Board For Diy SpeakerU7Z7) 2X(Mp3 Wireless Bluetooth 4.2 Audio Receiver Decoding Board For Diy SpeakerU7Z7) 2X(Full patch process Wide range of operating voltage Power supply reverse protection Dual audio output terminal External antenna (for mounting inside a metal box) BT Bluetooth module V1.1 Input voltage: DC5V-35V Bluetooth version: 4.2 Working temperature: -40 ° C to 85 ° C Peripheral size: 55*32*9 (length * width * height) (mm), can be used in combination LED indicator: Flashing: waiting for a connection Slow flashing: audio playback Steady on: connected Color: black material: plastic Package contents: 1* module)