Three row of demonstrations, Metal outer covering, superficial belt wear-resisting galvanizing. Mirror surface wear-resisting flower processing Waterproofing, quakeproof structure. 10 districts, Partition memory memory, The precise value reaches 1/,100 second time May initialize the countdown and have the idea number of times Function 9 hours 59 minute 59 second time functions The clock frequency may choose 10 time/Divides ---320 time/Divides and has the idea number of times function May establish decides the noisy time Lightly touches the type micros witch, feel is keen The power source is CR2032 the 3V lithium battery Net weight: 95 grams May select and purchase the belt compass