Technical specifications. 1: Power supply. Dual AC12V transformer , 5W or more, recommended Dual 10W 12V transformer. 2: Audio output. RCA stereo audio output 3: 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: green Material: PC+Metal Usage. 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 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 === waiting for pairing status Blue light === Connected to the phone Red 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 cable External LED display board Size: 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. , =164KBPS Package Contents: 1 x Receiver board Kit Only 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.