1. High-end and exquisite appearance, exclusive appearance patent, built-in ceramic Bluetooth antenna; 2. Adopt Bluetooth 5.4 chip decoding, with stronger compatibility and stability; 3. Equipped with RGB breathing light, exquisite and cool, with built-in AUX interface; 4. Bluetooth reception (RX), support one to two; 5. The receiving mode has been upgraded to one-to-two, so you can connect two mobile phones to listen to music at the same time; Built-in 300mAh rechargeable lithium battery, can for about 8-10 hours, fully in 1.5 hours, and standby battery life can reach 30 days; Supports calls, navigation, and music listening, clear sound quality, driver-free and easy to use; The product is easy to connect, without any driver or tedious APP download; Bluetooth version: Bluetooth V5.4 Bluetooth protocol: RX: A2DP AVRC Working frequency band: 2.402GHz -2.480GHz Power level: Power level 2 (Class II) Sensitivity: -85dBm Less than 0.1%BER Signal-to-noise ratio: 90dB Distortion: 0.02% Interface type: Input: 3.5mm AUX Output: 3.5mm AUX Supported protocols: , AAC Built-in battery: 3.7V/300mAh (1.11W) Charging current: about 200mA Charging time: about 1.5 hours Battery life: RX about 10-12H Bluetooth distance: 10-20M (under barrier-free conditions) Charging method: Type-C DC5V 1000mA Compatible devices: for Android, for It can be connected to IOS mobile phones and iPads, active speakers, amplifiers, and Bluetooth speakers or headphones that support A2DP/protocol. Color: Black Material: plastic Package Contents: 1 x Bluetooth Receiver 1 x Type C Cable 1 x English instruction 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 picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.