Limestone cement and bamboo wireless Version 5.0 speaker with rechargeable Li-on 600mAh battery. Output data: 5W. Playing time approx. 4h. Frequency : 200Hz -18kHz. Signal-To-Noise: ?90dB. Bluetooth transmission distance: 10 meters. Single coil wireless charging with 5W output. Bamboo is a natural product, there may be slight variations in color and size per item, which can affect the final decoration outcome.