The HS3BS1S Wireless battery siren is the ideal expansion accessory for larger family homes. Simply link it to your existing Honeywell home alarm, and the loud 105dB alert will warn you during emergencies, whilst intermittent flashing LEDs provide a distinct and visible outdoor deterrent to potential intruders. Easy to install, use and maintain. The battery lasts up to 2 years, and thanks to the easy-open battery compartment, the siren is easy to maintain. Wireless and easy to install. Range 200m. 868MHz. Panic button feature. Entry_exit delays. Fully expandable system - up to . Pack includes: LED indicators. Siren. Batteries; fixings and installation DVD. Batteries required: 4 x (included), . Size H29.7, W19, D10.8cm. Weight 1270g. Manufacturers 2 year guarantee.