Designed with a reminder rope to alert the rider or others that a lock is in place and must be removed before riding. Suitable for disc brake discs with a diameter greater than 7mm, and compatible with road bikes, mountain bikes, electric bikes, and motorcycles. Custom 4digit password, easy to set and not easily cracked, enhancing security during use. Made of aluminum alloy, lightweight and durable, with resistance to prying and long lasting performance. Use scenarios: Urban commuting: Park your road, mountain, or electric bike at a cafe or store. The reminder rope helps you remember to remove the lock before you ride away. Stopovers during rides: Secure your bike at rest points or trailheads while taking a break, then easily unlock with the 4digit code when you resume riding. Motorcycle or scooter parking: Attach and secure at parking lots, gas stations, or transit hubs to deter theft and keep your vehicle protected.