ELECOM Security Key Box Key Storage Box Dial Type (4 Digits) Anti-theft This is a security key box used for handing over and storing valuables such as keys. It has a 4-digit dial lock, eliminating the worry of key loss, and you can set it to any desired PIN. If the doorknob is thin, please use the handle resin parts together. * Depending on the type of doorknob, it may come off even if you use the handle resin parts. Please refrain from using it in places with high temperatures, high humidity, or exposure to rain. This product is not waterproof. It does not have anti-skimming effects. Please be aware of this.