1. Mono output, the wiring can be connected by two channels2. The product is small3. Simple to use4. Suitable for DIY crowd5. Wide range of applications: Bluetooth speakers, toys, massage chairs, household appliances, electric vehicles, lighting, etc.Input voltage: 5VOutput: Audio HeadphonesType: Bluetooth Audio moduleThe batches are different, the back of the product has and no at random, you cannot choose the specified style, it does not affectcolor:GreenMaterial:PCBsize:23 x 14mmPackage Contents:5 x CA-6928 Bluetooth Audio moduleOnly 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.