Detailed Product Description 4 groups digital clock timer:1, patented products2, 4 group bell ring countdown timers ; 4 groups bell ring timers can be set at the same time. The max countdown time reaches 99hours 59minutes59seconds.3, count up and count down function;4, Big and clear LCD display; 5.Easy to operate;6, There is magnet, support and hang hole at the back side of the products;