Remax RB-M27 Portable Bluetooth Speaker

Battery Type: Lithium

BatteryMaterial: Aluminum

Transmission Distance: 5m

But no matter what size or shape, they all work the same way. Bluetooth is simply a wireless technology that lets two devices talk to each other. In the case of Bluetooth speakers, your smartphone, tablet, or other device transmits to the Bluetooth speaker which uses its built-in amplifier and speakers for playback.