A narrow LED light strip running all around accentuates the shape and also serves as a charging and Bluetooth control display. With 3 watt output, rechargeable battery and playback option via SD memory card. Bluetooth: 5.0 Power Output: 3 W Input: DC 5 V / 0.4 A Average playback time on full battery charge: 3-4 hours (medium volume setting) **The laser engraving outcome may be influenced by the nature of the bamboo material (lighter / darker shades at certain areas)