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. 4. Bluetooth power amplifier, it can be used after connecting to the power supply and speakers, wireless transmission, high-fidelity sound quality 3. Output power: The maximum power of a single board is 30W, and the two-board connection is 30W+30W. Advantage: 1. Stable performance, strong signal reception, straight-line distance of 15 meters Due to different batches, there may be differences in the appearance, color, and printed text of the product, which will not affect its use 2. Input voltage: DC 8-24V, can be powered by lithium battery or DC power supply