The LD-381 smart alarm door lock, marketed under the PERFECT GUARD SHOCK SENSOR brand, brings active electronic security to standard deadbolt-style door locks in a zinc alloy die-cast housing. This innovative door lock features a highly sensitive shock sensor module that continuously monitors for impacts, drilling, kicking, and other forced-entry attempts, triggering a loud 105-110dB siren alarm the moment tampering is detected. The alarm serves as both a deterrent, startling intruders before they can gain entry, and an alert system, notifying occupants and neighbors of an ongoing break-in attempt. With double locking capability from the outside via key and convenient button locking from the inside, this lock provides flexible operation that suits the daily routines of homeowners and tenants alike.

Constructed with a hardened steel bolt offering a full 25mm (1-inch) throw, the lock delivers formidable mechanical resistance against kick-in attacks and bolt-manipulation techniques, while the zinc alloy body provides structural rigidity and corrosion resistance. The brass 5-pin tumbler cylinder ensures smooth, reliable key operation with good pick resistance, and each lock is supplied with two precision-cut brass keys. The lock body measures 70x50mm and fits standard 60mm or 70mm backset preparations, accommodating door thicknesses from 35mm to 50mm - covering nearly all residential and light commercial door types. Installation follows standard deadbolt procedures and can be completed with basic tools, making it suitable for both professional locksmith installation and confident DIY homeowners.

The alarm system is powered by four standard AAA batteries, which are readily available worldwide and easy for end users to replace. The low-power design ensures months of reliable standby operation, and a low-battery indicator alerts users when replacement is needed. Available in four distinctive colors - Silver, Yellow, Red, and Black - the lock allows buyers to match or accent their door hardware aesthetic while the bold PERFECT GUARD SHOCK SENSOR branding on retail packaging effectively communicates the product’s premium security features at the point of sale. Each set comes complete with the lock body, strike plate, mounting screws, and two brass keys in an attractive color box that is ready for retail display or direct-to-consumer shipping.

For wholesale distributors, hardware retailers, and security product suppliers, the LD-381 represents a high-value smart security product with strong margins and broad market appeal. With an MOQ of 150 sets, mixed order support across all four color options, and comprehensive OEM customization including logo engraving, custom decals, branded packaging, and tailored alarm parameters, the lock can be adapted to nearly any distribution channel or brand requirement. Certified to CE, ISO 9001, and RoHS standards, it meets international quality, safety, and environmental compliance benchmarks. With a production lead time of 15-25 days and samples available for evaluation, this smart alarm door lock is an ideal addition to security hardware catalogs, home improvement chains, e-commerce platforms, and building supply distributors seeking to offer their customers upgraded door security with active alarm protection.