FDS-10 digital lock is an indoor lock with main features including black color, 30-45mm thick door, polymer and zinc alloy materials, -15ºC ~ 55ºC working temperature, registration of up to five numeric passwords, factory default password 1-2-3-4-5-6-7-8-9-0, intruder alarm, low battery warning, power supply of 4 1.5V alkaline AA batteries, and a service life of 4-8 months, considering 10 openings per day.