ALS Large Heavy Duty Electronic Wall SafeProduct Description ALS Large Heavy Duty Electronic Wall Safe Simple programmable Electronic Lock with buzzer and LED. 3 to 8 numbers. Code can be changed infinitely. Fits between the studs. Easy to install yourself. Runs on 4AA SIZE(1. 5V) backup batteries. Batteries included.** With 2 high security manual override keys. Constructed with solid steel to resist hand and mechanical tool attacks. Bottom lined with foam. Pre drilled holes inside the safe