1. Mono output, the wiring can be connected by two channels 2. The product is small 3. Simple to use 4. Suitable for DIY crowd 5. Wide range of applications: Bluetooth speakers, toys, massage chairs, household appliances, electric vehicles, lighting, etc. Input voltage: 5V Output: Audio Headphones Type: Bluetooth Audio module The batches are different, the back of the product has text and no text at random, you cannot choose the specified style, it does not affect color:Green Material:PCB size:23 x 14mm Package Contents: 5 x CA-6928 Bluetooth Audio module 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.