Turn-Lock feature allows the user to lock and leave without a key. Ideal for front, back and side entry doors where deadbolts are required. Grade 2 ANSI/BHMA certified. Commercial-grade clutching motor drive. Vandal-resistant free-spinning deadbolt turn. Code control, 6-digit programming code required to add and delete user codes. Warning sounds after four incorrect codes entered, keypad disabled for 30 secs. Mechanical key override. Pre-set with random 6-digit programming code and two random 4-digit user codes. 19 user code capacity, 10, 000 user code combinations. Blue LEDs illuminate the keypad on demand. Locks can be re-keyed to match existing locks. 9 V alkaline battery included. Fits most standard door preps. Just a screwdriver needed for installation on pre-prepped doors. Latch of 1 in x 2-1/4 in radius corner faceplate, 1 in housing diameter - requires 1 in edge bore, 1 in throw with Triple-Option square corner, radius corner and circular drive in faceplates. Strikes of 1-1/8 in x 2-3/4 in, square corner, no box, latch strike. Backset adjustable backset, fits 2-3/8 to 2-3/4 in backsets. Cylinder 5-pin solid brass, keyed 5-pin, C keyway, keyed different (KD). Door thickness 1-3/8 to 1-3/4 in. Nickel silver cut keys, 5-pin, C-section. Minimum 5-1/2 in center-to-center distance between cross bore holes. All-metal chassis and escutcheons. Silicone rubber, wear-resistant buttons.