?IMPORTANT ATTENTION---PLS MAKE SURE THE ARM CAN'T BE PUSHED UP OR DOWN WHEN THE LOCK IS UNDER "LOCK" OR "UNLOCK" POSITIONS. ?Why it is Necessary---Prevent children or pets from entering specific prohibited rooms. Prevent kids from playing with the doors and get injured. Avoid babies or pets from locking themselves in a room. ?Simple Design & Wider Application Ranges---Simple Design and comfort color schemes make the door lever lock fit more customers' home environment. Suitable for most kinds of the door lever handles in the market. ?Easy to Install---Install the door lever lock with the 3M VHB tape, no tools or drill needed. SAFELON adopts strong viscous 3M VHB tape, no need to worry about the adhesive failure. Pls note the tape's effect will be better after 24 hours. The 3M VHB tape is easy to remove and with no residual on the surface, so no need to worry about the damage to the door. ?Special Locking & Unlocking Operations---Compare to the similar locks in the market, the SAFELON door lever lock's locking & unlocking operation is much smoother and easier for adults to use. Simple appearance can greatly incorporate into your home design, reduce the curious babies' attention.