1、You can DIY a for Bluetooth speaker, just need a battery(this product doesn't include battery), two speakers, and a case then you will get a nice for Bluetooth speaker. 2、Output 5W + 5W dual‑channel stereo audio, support USB sound card, no driver, just plug and play. 3、Mini for Bluetooth audio receiver board updates to for Bluetooth 5.0 version, which is compatible with most mobile phones and for Bluetooth adapters. 4、The mini for Bluetooth audio receiver board is updated to for Bluetooth 5.0 version, compatible with most mobile phones and for Bluetooth adapters. 5、The maximum transmission distance is about 15 meters, and the power consumption in standby mode is ultra‑low. Item Type: Power Amp Module Voltage: 3.7V-5V Current: 1.5A-2A Power: 5W + 5W For Bluetooth: 5.0 Speaker: 4Ω/3W (not included) Screw Hole Diameter: Approx. 1.6mm / 0.1in Size: Approx. 40mm / 1.6in 22mm / 0.9in 27mm / 1.1in 34mm / 1.3in 2 x Power Amplifier Board 6 x Connection Line