GHome Smart Fingerprint Door Lock with Keypad Door Knob,Biometric Door Smart Lock & App Control, Suitable for wooden or steel doors from 3.5-5.5 cm / 1.38-2.17 inch, Aluminum Alloy, Interior Door Knob with Key Great for Bedroom, Apartments, Offices and Hotels, Uses 4 AAA batteries, The product does not come with a battery