1) Comes with spare replacement batteries
2) Motion sensitive hardened steel lock
3) When the lock is vibrated twice within 5 seconds the alarm will sound
4) The alarm sounds in 10 second intervals
5) 3 matching copy protected keys are included
6) Corrosion Resistant.
This Alarm Lock is a hardened steel padlock which has an in-built alarm which will omit a siren of 110 decibels if touched or tampered with in any way thus alerting you to unwanted attention.