Grey & Blue 'Bird Song' Wall ClockThis clock does not make the traditional cuckoo clock sound, every hour it comes out to sing a little bird song Clock with a battery powered pendulum mechanism that shows the time and lets the bird know when to chirp. Between the hours of 10pm and 5am, the clock is quiet to allow you to sleep without being disturbed. You can also select if you want the bird to chirp during the day or remain silent, and the volume level is adjustable. Requires 3 x AA