If you have any questions, feel free to contact us 2 AA BATTERY OPERATED: Can be charged with a data cable (battery not included) EXCELLENT QUALITY: piano color + high pine top SNOW PACKAGING: Sending your friends,lover,father,supervisor is a good choice COMPLETELY MUTE: Nice box,the engine doesn't make a single noise when it is running.If you don't see,your clocks turning in the box, youwouldn't know,that they are running,it really is totally quiet!