specification: 1.function characteristics:shake, light , sound 3 in 1 2.to complete the process of electrification in 3 minutes 3.the japanese sony original lithium battery is inside, do not need to replace battery in 5 years 4.256 ks, can save 8000 datas 5.waterproof, shockproof, defend to press, dustproof, antisepsis 6.3 in 1 design for communication seat ( download the data, make plans for patrol, electrification) 7.id button is hard and durable,can be installed with mind, will not be influenced by the enviroment.