5.0 wireless speaker in Bamboo front, ABS back and 10W wireless charger. Connect device to your computer, place smartphone on charging area to charge. 1 Rechargeable Li-Ion 1800 mAh battery. Output data: 3W, 4 Ohm. Playing time approx. 2h. Bamboo is a natural product, there may be slight variations in colour and size per item, which can affect the final decoration outcome.