This is a smartphone speaker made from natural solid cedar wood. A cedar block has been hollowed out to house the speaker and amplifier. Connect the power and play music via Bluetooth from your smartphone. Size (approx.): Width 14cm, Depth 7cm, Height 6cm The power supply voltage is 5 volts; please use a smartphone charger or similar. A dedicated power cable is included. This is a handmade item, so it is not a perfect product. I made this for those who appreciate the beauty of solid wood.