【Wide Use】: Door knob lock -Suitable for standard door handles/handwheels - Suitable for round, tulip and oval door handles, not suitable for lever door handles. 【No need to disassemble】: Alzheimer's door lock-Lock the valve, faucet, also portable security door lock, childproof door knob cover. 【No Entry】: Door lock cover - When the payment is in arrears, it can be used to refuse entry to the rental property without the need to change the door lock immediately. 【Prevent getting lost】: Door knob lock cover- Prevent dementia or psychopaths from getting lost. 【Prevent going out】: Door knob lock - Prevents children from sneaking out and locks up the escape artist. *Bedroom door lock from outside - Scenario 1: When you are out and about, you can use this device lock knob to prevent unauthorized spare keys from entering the room for added security. Case 2: When you sleep at home or in a hotel, you can also use Doorknob lock for added security. Case 3: Preventing children or people with dementia (Alzheimer's) from getting out of the house.