Opening Mode: After installed the electric drop bolt lock, the door will be locked when power on, and unlocked when power off Adjustable Time Delay: Electric mortise lock is designed with 0s, 3s or 6s adjustable delay time, bringing you more convenience Strong Structure: Electric drop bolt lock is made of premium aluminium alloy material, waterproof, high hardness, anti rust, wearproof Applicable Door Type: Electric bolt lock can be used for wooden doors, s doors, metal, security doors, fire doors and so on Installation Way: Electric mortise lock supports a variety of installation, surface installation, side installation, top installation, to meet your different needs, Manufacturer: SEVEQIS