Material The case of this analog mechanical timer is made of high quality plastic and zinc alloy movement, sturdy and durable. The chess timer is lightweight and requires no batteries. Long service life, it is your best choice. Mechanical Structure The mechanical structure with timing start button is adopted to make timing operation intuitive, convenient and accurate. Easy to Use This chess timer is easy to use. Press the left button, timing stop left timer and right timer start timing, vice versa. Press two buttons in half at the same time, both timers are in the stop state, insert the clip to ensure the stop state. Widely Used Professional chess timers can be used for various chess time clocks. Such as chess, going or Chinese chess. Suitable for all types of chess games. You can also use it as a decoration in your home or office. Size: approx. 15 x 5.5 x 9 cm