• Visible link quality indicator on device • Vandal-resistant design • Dual Technology PIR and K-Band Microwave frequency to reduce false alarms • Anti-disguise mode to prevent intentional circumvention of the detector • Dimensions 115 x 60 x 48mm (4.5 x 2.3 x 1.1in) • Battery Life 5 years (typical use) • Battery Type 3V CR123A Lithium Battery • Weight 90g (3oz) • Operating Temperature -10°C to 55°C (14°F to 131°F)