STI's supervised wireless door alarm (Part # STI-6400WIR4) helps stop unauthorized exits and entries of fire/emergency doors. When activated, it emits an ear piercing 105 dB alarm for 30 seconds, three minutes or continuously and sends a radio signal to an STI receiver (up to 1000 foot line of sight range), alerting it has been triggered. This multifunction alarm includes a delay option for authorized exit and entries. Compact 5.375” diameter, super tough polycarbonate. 9 VDC alkaline battery and warning sticker included.
More Info: www.sti-usa.com/cd27