Long-Range Door Opening Alert Chime

This wireless door chime system delivers real-time audible alerts when any door or window opens. Includes one pre-paired magnetic sensor and one AC-powered receiver. Sensor dimensions: 2.3 × 1.2 × 0.7 inches (58 × 30 × 18 mm); weight: 28 g. Receiver dimensions: 4.7 × 2.6 × 1.4 inches (120 × 66 × 35 mm); weight: 120 g. Sensor powered by 2 × AAA batteries (not included); receiver uses standard UK/EU mains socket. Radio transmission: 433 MHz, stable range up to 500 feet indoors — sufficient for three-storey Victorian terraces or medium-sized retail units. Durable ABS casing resists dust, minor impacts and daily handling. Receiver offers 26 chime variations, five volume tiers (0–110 dB), mute function, and LED status lights. Settings persist after power loss. Mounting is fully adhesive — no screws, wires or electrician needed. Compatible with interior/exterior doors, French windows, patio sliders and cupboard doors. Each added sensor can trigger a distinct tone — allowing instant recognition of entry point. Used widely across UK contexts: child safety in nurseries and bedrooms; fall/wandering prevention in dementia-friendly homes; and footfall awareness in hair salons, cafés, boutiques and reception-led offices where staff may be away from the entrance during peak hours.