500 FT Wireless Entry Chime

A fully wireless door entry alert system comprising a slim magnetic sensor and a compact plug-in receiver. Sensor size: 2.4 x 1.2 x 0.6 inches; receiver size: 3.5 x 2.2 x 1.1 inches. Sensor runs on two AAA batteries (not supplied); receiver uses standard UK mains power. Operates on a stable 433 MHz frequency band with up to 500 feet open-field range — verified in mixed indoor environments including multi-storey UK homes and ground-floor retail units. Features 26 selectable chimes, five stepwise volume levels (including full mute), LED status lights, and automatic memory retention for both melody and volume settings. Pre-paired at factory — zero setup complexity. Mounting uses strong double-sided tape compatible with painted wood, uPVC, and metal surfaces. Intended for dual-purpose use: domestic safety (e.g., preventing unauthorised exits by young children or cognitively impaired individuals) and commercial awareness (e.g., alerting sole traders or boutique staff to footfall without relying on mobile phones or unreliable Wi-Fi devices). Each added sensor can be assigned a dedicated chime, enabling intuitive spatial awareness across up to six doors or windows using a single receiver. No hub, no app, no subscription — works independently as a self-contained electro-mechanical alert system, aligning with UK consumer preference for privacy-first, offline-capable devices.