Defend to throw to guard against theft Look for the function Green environmental protection, have no radiation The sound of adds the vibration to report to the police the mode More more elegant and cleverly made than DT-310 take the convenience From establish the safe scope etc.( defend to throw to look for can according to drive the protection object from establish the distance of 0-25 meters) The kid& pet defends to throw The purse& box wraps to guard against theft Take the product or valuableses to defend to throw to defend to forget to guard against theft along with Spefication: Shape specification:28.5(H)*23.2(M)*7.5(D)mm Weight:9.3g Battery:The CR2032 * 1 Receiver: Shape specification:60(H)*36(M)*15(D)mm Battery:7number battery *1