Swann Passcode Protected Motion Alarm SW351-KCH Passcode protected, powerful siren 110dB+ sounds when any activity is detected by PIR movement sensor 120 degree approximately) wide angle detection with multi-directional mounting bracket 2 Settings - chime sound (alert mode) & 110dB+ siren (arm mode) selection Use in conjunction with other alarm products to maximize your safety Powerful 120+ Db Siren Sounds When Any Activity Is Detected By Pir Movement Sensor 120 Wide-Angle Detection 2 SettingsChime Sound In Alert Mode & Siren In Arm Mode Compatible With External Siren, Magnetic Sensor Or Shock Sensor Easy To Use With Entry & Exit Delays