Designed with a reminder rope to remind oneself or others that there is a locks on the bike that needs to be before riding Make of aluminum alloy, light weight and enduring, with resistance to prying and durability customs 4 digit password, easy to set and not easily cracked, enhancing the security of use Compact in size, easy to carry around, suitable for various bicycles and electric bike Suitable for disc brake discs with a diameter greater than 7mm, suitable for road bikes, mountain bikes, electric bikes, and motorcycles