Built-in digital-to-analog chip, easy to support audio equipment AUX/RCA/digital optical fiber/coaxial interface plug and play. Innovatively equipped with LED digital display screen, the working status is clearly visible, and the operation is no blind. Support NFC touch and connect, equipped with multi-function buttons. Bluetooth receiving+Bluetooth transmitting+FM transmitting Bluetooth 5.0 chip three-in-one to meet the needs of devices. Exquisite and body, the surface is made of fire-resistant PC material, the high-gloss paint process is minimalist and unique in shape, and the design of red and blue breathing lights is more exquisite. Bluetooth version: Bluetooth V5.0 Supported protocols: : A2DP AVRC TX: A2DP Working frequency band: 2.402GHz -2.480GHz Power level: Power level 2 (Class II) Sensitivity: -85dBmLess than 0.1%BER Signal-to-noise : 90dB Distortion: 0.1% Interface Type Input: 3.5mm AUX+RCA+optical fiber+coaxial+USB+TF interface Output: 3.5mm AUX+RCA Fiber parameters: support fiber input, 16M, sampling rate 99kHz Supported formats: MP3/WAV/WMA//FLAC/G729/M4A/ALAC//DTS/MIDI/G726/MTY Screen size: 36 x 8MM Working current: Less than 40mA Built-in battery: 3.7V/500mAh Charging current: about 400mA Charging time: about 2 hours Battery life: about 10H, TX about 8H Bluetooth distance: 10M (open place) Charging : -USB 5V/0.5A Compatible devices: Android, IOS system mobile phones and PADs, active speakers, power amplifiers, and Bluetooth speakers or earphones that support A2DP/protocol. Product size: 92 x 65 x 20mm color: Black Material: PC Package Contents: 1 x Bluetooth Adapter 1 x Type-C Charging Cable 1 x 3.5mm Audio Cable 1 x Red And White RCA Lotus Wire 1 x IR Remote Control 1 x English Manual 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.