Two pre-programmed codes enable easy out-of-the-box setup High-quality metal construction ensures long-lasting strength Grade 2/AAA rating delivers the trusted security you need for residential and light commercial settings Durable, silicone-coated numbers light up when pressed for easy code entering in low-light situations Up to 19 codes are available to assign to trusted friends and family members 9V deadbolt battery provides up to two years of battery life with typical use, with a dedicated low-battery indicator to display battery health Easy install process lets you replace your existing deadbolt in minutes with just a screwdriver - no hardwiring required