One of my favorite is the Guri-chan. Guri-chan is a radio-controlled clock that receives the time calibration signal(JJY).
The name "Guri-chan" originates a place Greenwich that passes Greenwich meridian.
This clock may fail to receive the time calibration signal in noisy environment such as near a personal computer. So installation place of this clock is required careful consideration. I recommend you place this clock at the window.