❀Features a copper alloy sound generator producing 100dB rings, effectively warning and cyclists. Ideal for mountain and road biking scenarios. ❀Compacts 5.50x5.50x2.7cm size and 37g weight minimizes riding burden. Perfect for hiking, climbing, and running activity. ❀Combines copper/aluminum alloys with stainless steel for longer lifespans than bells. Withstands various weather conditions reliably. ❀Quickly response ensures effortlessly use for and seniors. Solves traditional bells hard to press issues. ❀Waterproof with high elasticity spring for enhances sound. Performs flawlessly in rain during outdoor.