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 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 Application fields: Bluetooth speakers, toys, massage chairs, household appliances, electric vehicles, lighting, photovoltaic products, fitness equipment, etc. Due to different batches, there may be differences in the appearance, color, and printed text of the product, which not affect its use Colour:Green Material:PCB Size:40x35MM 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.