Large capacity Li-Poly battery allows PT4200 meets your need for long time communication. Aluminum alloy rear cover offers better heat radiation. The PTT button made of hard rubber with good durability is easy and convenient for the operator. These new technologies improve the performance of the whole unit and make it a superior two-way radio. Channel Annunciation and Emergency Alarm are two favorite features for security. The radio features compact and elegant shape, easy carrying and crisp voice; is an ideal communication tool for users of security company, restaurant, club, fieldwork and construction.