Houdini Click N Lock is a lifesaving child safety device designed to prevent the accidental release of the seat belt buckle that is anchoring a capsule, infant seat or booster seat. Click N Lock is an essential part of preparing for the safe arrival of your baby! Easy to install. It has smooth safe edges and users can be confident their children are still safely buckled in when they are using this Houdini Solution. FEATURES: No Sharp Edges. Simple to Install. Fits most standard top release vehicle seat belt buckles. Suitable for use with most age ranges, including the elderly & special needs. Prevents unsuspecting adults and inquisitive children from accidentally releasing the seat belt buckle. Use when securing both child car seats and booster seats. Simple, safe, effective. Keeps car trips safe and frustration free.