Easy installation with no tools required. This lock can be used as a secondary lock when window is shut, or as a secure lock when windows are opened slightly for ventilation. This product does not guarantee total crime prevention; Please use this product along with other crime prevention tools. The locking device allows you to prevent your children from gaining access to off-limits areas that could put them in danger, or cause them harm. Opened manually to avoid locked due to automatically lock up.
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