With the help of this Man Trap Alert Type MTA, a person trapped within a frigid room can call for help by sounding an externally placed acoustic-luminous alarm. Due to the external unit's buffer battery, this Man Trap Alarm Type MTA will continue to function even in the case of a brief power outage. a control unit with an audio and visual alert. It has a bright emergency in-room push button and a buffer battery. It offers flexibility and is inexpensive.