This product has been discontinued.
The Multilink facility on the heavy duty Howler site alarms allows up to 50 units to be interconnected by wire. The heavy duty Howler site alarms have a tough aluminium construction, designed for long term use in demanding environment conditions.
HMCP/ML - Call Point switch: HSHMCP/ML
HM1/ML - Push on/off switch: HSHM1/ML
HM2/ML - Push on/Twist off switch: HSHM2/ML
HM3/ML - Push on/Key off switch: HSHM3/ML
9V PP9 Battery