The tail light runs on a built-in rechargeable lithium battery, so there is no need to buy replacement coin cells, and a single charge lasts about 14 hours in breathing (pulsing) mode. Charge it via its charging cable whenever the light starts to dim, and keep a habit of topping it up before longer weekend rides so you are never caught without a rear light after dark.

The tail light is versatile enough to mount either on the rear vent of a compatible Sunrimoon helmet or clipped onto your bike's seat post or seat rail, whichever suits your riding setup. Many riders also use it clipped to a backpack strap as an additional warning light, since the compact clip-on design works across a few different mounting scenarios.

This tail light offers five light modes, including steady and pulsing 'breathing' settings, so you can choose a mode that balances visibility and battery life depending on whether you are riding in city traffic or on a quieter stretch of road. The breathing mode is the most battery-efficient, giving around 14 hours of runtime per charge, which comfortably covers several commutes or a long weekend ride.

This tail light is designed to be compatible only with the Sunrimoon TS-99 and CS-07 Zeta helmets, and it is not intended as a universal helmet accessory. If you own a different Sunrimoon helmet model or a helmet from another brand, please mount this light on your seat post or bike frame instead of trying to fit it to an incompatible helmet, since the mounting point is specific to the TS-99 and CS-07 Zeta design.

The light carries daily waterproof protection, meaning it can handle rain, splashes, and everyday moisture during monsoon commutes, but it is not built to be fully submerged in water. We recommend wiping it dry after very wet rides and avoiding prolonged submersion, such as riding through deep waterlogged streets, to keep it working reliably over time.

Yes, this tail light is a genuine Sunrimoon product sold through DoGoodCo, so you get authentic build quality and the compatibility promised for the TS-99 and CS-07 Zeta helmets. It comes with standard manufacturer warranty coverage against manufacturing defects, so reach out to our support team if you notice any issue with the battery or light modes soon after purchase.

Orders are typically dispatched within 3 working days of order confirmation, and since DoGoodCo is a prepaid-only store, cash on delivery is not available, so all orders are paid for at checkout. The overall delivery timeline depends on your specific location and pin code across India, so please check the estimated delivery window at checkout for your area.