Wireless Door Open Alarm 108dB

This 2-pack wireless door alarm system delivers a sharp 108 dB warning tone and functions independently on two AA batteries (not included), with up to 2 years of operational life. Each unit is housed in robust ABS plastic, measuring approximately 6.5 × 4.2 × 2.1 cm and weighing around 65 g. Magnetic sensing depends on correct spacing (≤2 cm) and directional arrow alignment between sensor and magnet — a requirement clearly illustrated in the included manual. Four functional options are available: timed alarm (3/15/30/60 sec), general open-door alarm, constant alarm, and one-shot chime. The package comprises 2 alarm units, 2 magnetic strips, industrial-grade double-sided tape, and a step-by-step printed guide. The timed alarm mode is especially effective for freezer applications: it begins quietly and ramps up to full volume, prompting action before temperature loss escalates. General mode offers simple, intuitive feedback — alarm sounds while open, stops when sealed. Constant mode remains active post-closure, flagging potential latch faults or forced entry attempts. Chime mode provides gentle, non-alarming feedback — ideal for notifying staff in cafés, libraries or reception areas without disrupting atmosphere. Used successfully across UK contexts: domestic kitchens with older freezers prone to seal failure, university dormitory fridge banks, NHS community pharmacy cold storage units, independent shop backroom coolers, serviced apartment pantries and garden shed tool lockers — wherever audible door status improves efficiency, safety or compliance.