Wireless indoor siren for Smart Security System 700. For internal acoustic and visual alarms. Very loud siren (95dB(A)/1m) and 3 bright flashing LEDs to deter intruders and warn residents. Radio frequency: 868MHz. Power supply: 5V DC via included power supply unit with 1.8m DC cable and emergency power supply via 4x 1.5V AA alkaline batteries (not included). For standing or wall mounting using the included bracket and fastening screws. Dimensions: 87 x 120 x 39mm.