The appearance is high-end and exquisite, with exclusive appearance patent and built-in Bluetooth antenna. Qualcomm Bluetooth 5.2 chip decoding is adopted, which has stronger compatibility and stability. Equipped with RGB breathing lights, exquisite and cool, with built-in AUX interface. Bluetooth reception (RX), Bluetooth transmission (TX), 2-in-1 design. The receiving mode is upgraded to one-to-two, and two mobile phones can be connected to listen to music at the same time. Supports multiple lossless decoding formats , AAC, , -LL, -HD, -AD, and the sound quality is more beautiful. Built-in 300mAh rechargeable lithium battery, listening to music for about 8-10 hours, full of 1.5 hours, and standby life of up to 30 days Support calls, navigation, and listening to music, clear sound quality, driver-free and easy to use. Product model: A5 Pro Bluetooth version: Bluetooth V5.2 Supported protocols: RX: A2DP AVRC TX: A2DP Working frequency band: 2.402GHz -2.480GHz Power level: Power level 2 (Class II) Sensitivity: -85dBm Less than 0.1percent BER Signal-to-noise ratio: equal 90dB Distortion: less than equal 0.02percent Interface type: Input: 3.5mm AUX Output: 3.5mm AUX Supported protocols: , AAC, , -LL, -HD, -AD Built-in battery: 3.7V or 300mAh (1.11W) Charging current: about 200mA Charging time: about 1.5 hours Battery life: RX about 10-12H, TX about 10-12H Bluetooth distance: 10-20M (under barrier-free conditions) Charging method: Type-C 5V or 1A Compatible devices: for Android or IOS mobile phones and PADs, active speakers, amplifiers and Bluetooth devices supporting A2DP or protocol Colour:As Shown Material:ABS Package Contents: 1 x HIFI Audio Adapter 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.