This is a new, unused item that has only been tested for functionality. It can emit light in three modes: constant on, flashing, and fast flashing, each time the button is pressed. It uses two CR2032 button cell batteries. It will be disassembled and shipped in simple packaging. To prevent discharge, the insulating paper that was originally placed between the batteries will be left in place. Please remove it before use. Since some time has passed since the purchase, the remaining battery life is not guaranteed. ---The following is a product description--- 【Long-lasting battery】Battery-powered with a long operating time. Even if the battery runs out, you can revive it immediately with spare batteries or even at a convenience store, making it ideal for brevet or everyday use. 【Smart appearance】A simple and smart appearance that doesn't interfere with the beautiful form of the bike. It's unobtrusive and fits any bicycle. It's also compact, weighing only 27g. You can ride comfortably without feeling the weight even when dancing with the bike. 【IPX4 water resistance】Practical IPX4 water resistance. It is not affected by water splashes from any direction. 【Product Specifications】Bracket compatible diameter 22mm~35mm Weight 26g ≪2-battery type≫ Batteries used: CR2032x2 Estimated operating time: Constant on 50 hours, Flashing 150 hours *Actual operating time may vary depending on the usage environment and battery characteristics. ---The following is an explanation by AI--- 【High visibility】 This bicycle tail light uses bright LEDs to ensure high visibility even when riding at night. 【Durable material】 The aluminum body is lightweight yet durable. It is designed to withstand long-term use. 【Easy installation】 The clamping band installation method allows for easy installation on the bicycle without tools. - Color: Blue - Material: Aluminum - Application: Bicycle tail light - Shape: Round - Mounting method: Clamping band type - Light source: LED - Size: Compact Thank you for viewing.