1. Audio Receiver: Bluetooth-compatible 5.2 chip, 15M transmission distance, stable transmission signal. Support -HD audio codec, low latency+high-fidelity audio effect. 2. Output: Support 3.5mm Aux audio output, Toslink, coaxial output, and allow connecting different devices to (note: only one audio port output is supported, not three audio ports output at the same time). 3. Long Battery Life: Built-in 500MAh battery, which can work continuously for 10 hours after charging for 2-3 hours. 4. Applicable Occasions: It can be used to connect old audio/wired speakers to on mobile phones/tablets. It can also be used with car radio. Specification: Chip: QCC3031 Bluetooth-compatible version: 5.2 Input power: DC5V Transmission distance: 15M Power supply mode: Type-c port Battery capacity: 500Mah Duration: 10 hours Product function: Bluetooth-compatible reception/coaxial/AUX audio output/optical fiber Product size: About 73x70x20mm/2.87x2.75x0.78inch Weight of main engine: 60g colour:As Shown Material:Aluminum Alloy Package Contents: 1 * Audio adapter 1 * Antenna 1 * Charging cable 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.