Advantage: 1. Stable performance, strong signal reception, straight-line distance of 15 meters 2. Input voltage: DC 8-24V, can be powered by lithium battery or DC power supply 3. Output power: The maximum power of a single board is 30W, and the TWS two-board connection is 30W+30W. 4. Bluetooth power amplifier, it can be used after connecting to the power supply and speakers, wireless transmission, high-fidelity sound quality Due to different batches, there may be differences in the appearance, color, and printed text of the product, which will not affect its use Application fields: Bluetooth speakers, toys, massage chairs, household appliances, electric vehicles, lighting, photovoltaic products, fitness equipment, etc. Color: green Material: PCB Package Contents: 2 x Amplifier Board 4 x 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.