Four magnetic brake sensors included. This set provides four sensors, giving you enough components for multiple installations or replacements on one or more bikes. Waterproof design. The waterproof interface supports longterm use in various weather conditions, making it suitable for outdoor electric bicycle applications. Reliable cable length. Each sensor features a 35 cm cable, providing ample length for flexible installation and dependable braking performance. Normally open 2pin type. Designed as a normally open sensor, it enables seamless integration with your braking system and contributes to ride safety. Use scenarios: Spare parts for ebike maintenance or small fleet management, allowing quick swaps without downtime. Retrofit or replacement on multiple bikes in a workshop or rental fleet, simplifying inventory and installation. Outdoor riding in rain, dust, or harsh weather, where the waterproof interface helps maintain consistent braking performance.