The Twemco BQ-100 flip clock model has a 24-hour display and needs to be hung on a wall. This is a largest version of their flip clocks which can be read from over 40 meters away and perfectly suits in a living room or office. The clock takes two 1.5V alkaline battery size D battery (included) which should last you about 2 years. It features a top-end German Quartz movement at heart which will provide you with an accuracy of 1.5 sec/month between 20°C  to 25°C. 

About Twemco
Twemco is a specialised manufacturer of automatic flip clocks based in Hong Kong and has been renowned worldwide for over half a century. Since 1968, Twemco has developed the best fully automatic perpetual calendar digital clocks in the world. With over 50 years of experience and thanks to its excellent craftsmanship and unique features (patented invention), the brand has become an icon of clock making, interpreting the value of time. Please note that this is one of Twemco's commercial models, and all commercial models do make a little sound with every flip

Dimensions
Height: 47.6 cm
Width: 28 cm
Depth: 16.3 cm