Compatibility Designed for Merida MATTS 6.5 V 2021 — fits the bike's front and rear lamp positions. Key benefits Reliable visibility in poor weather: IPX5 waterproof rating and a durable aluminumalloy casing keep the lights functioning in rain and splashes so you can ride safely in wet conditions. No disposable batteries: builtin USB rechargeable battery with fastcharging technology reduces downtime and removes the need to replacement batteries. Simple, adaptable lighting: multiple modes cover common needs—, medium, low, flash, slow flash, and SOS—so you can choose steady or attentiongrabbing output depending on the situation. Easy to operate and maintain: intuitive button control for quick mode switching; straightforward USB charging for everyday use. Important attributes Material: quality aluminum alloy housing for impact resistance and heat dissipation. Weather rating: IPX5 for water resistance during rides in rain or wet terrain. Power: USB rechargeable battery with fastcharging support (no disposable batteries required). Modes: beam, medium beam, low beam, flash, slow flash, SOS. Function: Includes both headlight and taillight functionality; can be used as an emergency flashlight when needed. Practical applications / use scenarios Commuting in mixed weather: ride to work or school in the rain with consistent front and rear illumination and quick USB ups at the office. Weekend trail rides or evening training: switch between and low beam for dark singletrack, use flashing modes for visibility when sharing paths, and rely on the aluminum housing in rough conditions. Roadside emergency: use the SOS or steady flashlight mode during a night stop or mechanical issue to signal others and see points clearly. Why this product solves the problem Keeps you visible and safe in wet conditions without frequent battery changes. Fast USB charging and simple controls reduce preparation time so lights are ready when you are. Multiple modes provide both continuous illumination for riding and flashing/SOS options for increased visibility or emergency signaling.