Trenkle Quartz Cuckoo Clock Black forest house, turning dancers Colour: Walnut Size: 29 cm/11.6 inch The clock needs two baby C batterys and one mignon AA battery which are included in the shipment. Cuckoo calls on the hour with echo. The clock has a battery operated movement with automatic night-off by a brightness sensor. The running-time of the batterys is about one year. The size refers only to the clock, without pendulum and weights. 2 years product warranty. The clock is made of wood.