Alarm Systems, 433MHz
From Amazon
Yale HSA Essentials Alarm Kit, Battery Powered, 5 Piece Kit, Self Monitored, No Contract, Wireless, PIR Movement Sensors, Door/Window Sensor External Siren, Keypad, No Monitoring Fee
Wickes
Yale YES-ALARMKIT Home Security Essential Alarm Kit - White
OnBuy
Yale YES-ALARMKIT Essentials Alarm Kit, Battery Powered