Technical specifications. 1: Power supply. Dual AC12V transformer , 5W or more, recommended Dual 10W 12V transformer. 2: Audio output. RCA stereo audio output3: Pairing and connection. Bluetooth-enabled cell phones, computers, tablets, , set-top boxes.4: Antenna. External 3DB small pepper antenna. Receiving distance: unobstructed straight line distance of about 5-8 meters, does not support through the wall.5: Bluetooth chip, decoding chip, op-amp. Qualcomm QCC5125, AK4493 decoding chip. With JRC2114D or LME49720.6: What are the supported formats? Support LDAC, -HD, ASAPTIVE, -LL lossless transfer, transfer, AAC transfer. Lossless APE FLAC DSD 320K MP3 and so on can be played.Color: greenMaterial: PC+MetalUsage.1: Open Bluetooth Scan to LH 5.1 AK4493 LDAC local device.2: Pairing connection can be used when successful, very simple.3: Power off The time you open it, it will be automatically paired and connected, no need to operate again.Reminder: The Bluetooth light can only be scanned by the phone when the red and blue light is flashing.Bluetooth light status indication function.Red and blue light flashing === for pairing statusBlue light === Connected to the phoneRed slow flashing === already disconnected from the phone, then you can manually click the phone Bluetooth connection.AC dual 12V transformer power supply. (12V-0-12V) 3-wire transformer.Do not connect the 3 wires wrong.Gold-plated RCA audio output, computer USB socket Connect to computer USB.Comes with 3DB antenna and 10cm connection cableExternal LED display boardSize: 7.3CM X7.5CM"LDAC" is a technology developed by to transmit audio losslessly via Bluetooth at a transmission rate of 990kbps, allowing users to hear high ity music in 24-bit 96K format.LDAC format = 990KBPS = 24 bits 96K. HD =576KBPS=24 bits 48K. =384KBPS=16 bits 48K.AAC, =328KBPS=16 bits 44.1K., =164KBPSPackage Contents:1 x Receiver board KitOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.