The Link2Home Smart Alarm Kit contains everything you need to protect your home. It has WI-FI +Zigbee enabled activations and monitoring, supported via the Link2Home APP. It also features a built-in siren (95dB) and an external siren (105dB) with built-in backup. The system is battery powered, with up to 5 hours standby time. Contains 2 x PIR Sensors 1 x Door Sensor 2 x Remote Controls 1 x Keypad 2 x RFID Key Fobs 1 x Outdoor Siren 1 x Gateway with Built-in Siren All batteries/adaptors included. Specification PIR Range 8m Transmission Range 80m Battery Life up to 24 months Fixing Surface Mount