About this product: 1. This password keypad is suitable for folding doors, meaning the swing door operator can be equipped with it as an access control because its buttons have left and right arrows and are suitable for both left and right operation. Note: This is a standalone product and cannot be used without a matching universal receiver. 2. The appearance is waterproof, available in two colors, and the overall design is compact and practical. 3. The initial letter reads "Sender Name: Name...". Don't worry if you can't see clearly at night. The LED lighting allows you to quickly open the door when you get home in the evening. 4. The initial letter indicates the number of people who need assistance. If you forget the remote control, you can also conveniently enter the password. Specifications 1. Power supply: CR2032 lithium battery (230 mAh). 2. Battery life: about 1 year based on 10 uses per day. 3. Operating frequency: 433.92 MHz +/-75 KH 4. Transmitting power: approx. 1 mW 5.