Wireless Bluetooth 5.3 Audio Transmitter NFC Receiver Stereo HiFi Adapter AUX Features: Bluetooth 5.3 chip design, compatibility and stability is stronger. Bluetooth receiver (RX), Bluetooth transmitter (TX) two-in-one design. Receiving mode upgrade one tow two, can connect two mobile phones at the same time to listen to songs. Equipped with high-definition LED digital screen, full-screen display of working status and Bluetooth mode is clearly visible. Built-in digital signal to analog chip, support digital optical, coaxial, AUX, RCA interface. Upgrade wireless NFC sensor function, mobile phone connection/disconnection at the touch of a button. Cool RGB colorful lights, multi-color adjustable, soft and not dazzling. Built-in 1000mAh high-capacity rechargeable lithium battery, full of about 1.5h, about 10-12 hours of continuous listening, standby for about 30 days. Support USB (U disk) playback and startup, support a variety of lossless format audio file playback. Built-in high-definition microphone, supports wireless listening, hands-free calls, navigation. -Easy connection, without drivers and the fatigue of downloading APP. Specification: Bluetooth Version: Bluetooth V5.3 Support Protocol: RX: A2DP AVRC TX: A2DP Operating Band: 2.402GHz-2.480GHz Power Level: Power Level 2 (Class II) Sensitivity: -85dBm<0.1%BER Signal to Noise Ratio: ≥90dB Distortion: ≤0.1% Interface Type: Input: 3.5mm AUX/RCA New optical and coaxial USB Output: 3.5mm AUX RCA Optical Parameters: Support optical input, sample car support 32/44.1/48/96/192KHz, 24bit Support Format: MP3/WAV/WMA/APE/FLAC/M4A/ALAC/AMR Screen Size: 25*10mm LED Working Current: <40mA Built-in Battery: 3.7V/1000mAh(3.7W) Charging current: about 1000mA Charging time: about 1.5 hours Battery life: RX about 10H, TX about 10-12H Bluetooth distance: 10-20M (without obstacles) Charging method: Type-C 5V/1000mA Compatible devices: Android, IOS system mobile phones and PAD, active speakers, amplifiers and Bluetooth speakers or headphones that support A2DP/protocol Product size: 99.5*75*24.2mm (L*W*H) Product weight: about 105.55g Note: Fiber optic cable and coaxial cable are not included, you need to equip yourself. Package included: 1,Bluetooth adapter 1.Type C charging cable 1,3.5mm audio cable 1* Red and white RCA Lotus cable