EOS TK-5 PIR Compact Mini Alarm, 3-in-1 Chime Door Bell & Alarm, Detection Covers an Area of 120 Degrees at Distance of 8 Meters, Passive Infra-Red Sensor 3-in-1 Chime Door Bell & Alarm Detection Covers an Area of 120 Degrees at Distance of 8 Meters Passive Infra-Red Sensor Dimensions: 85 x 42 x 46 mm Weight: 71 grams