Smart Mail Alert Real-Time Sensor

Purpose-built UK mailbox sensor focused on notification certainty and installation flexibility. Dimensions: 65 mm L × 32 mm W × 18 mm H; net weight: 38.2 g. Enclosure: matte-finish ABS with IP54-rated seams and recessed battery compartment. Power source: CR2032 (installed), with low-battery indicator in-app. Wireless: Bluetooth 5.0 Class 2, supporting AES-128 encrypted communication. Mounting: peel-and-stick 3M™ tape (ISO-certified adhesion on painted metal) + pre-drilled screw points (M3). Temperature resilience: functional from -10°C to +50°C, verified across 12 UK postcodes in independent user trials.