For keyed exterior doors. Locked from exterior by rotating keyway or from interior by turn piece. Deadbolt opened from outside by entering valid user code when rotating keyway turn or by interior turn piece. Key can be used to unlock as backup. Dual option latch includes: 1/4" round corner and 1" circular drive-in latch. Adjustable for 2-3/8" or 2-3/4" backsets. Strike: 1/4" round corner full-lip strike. Grade AAA construction for superior durability and quality performance. 1 tool installation, 9V battery operation, 3 year battery life with low battery indicator. Large, easy-to-read numbers, lighted keypad. Store up to (19) 4-digit user codes. Silicon rubber buttons are epoxy-coated to prevent wear (won't show code pattern). Visual pack.