For Merida Reacto 4000 (2021) — Front and Rear USB‑Rechargeable Bike Lights Key benefits Built for your bike: Specifically compatible with the Merida Reacto 4000 (2021), providing a tailored front and back lighting solution without guesswork. Reliable in bad weather: Durable aluminum alloy housing and IPX5 water resistance keep the lights working in rain and wet conditions so you can ride with confidence. No battery swaps: USB rechargeable battery with fast‑charge technology reduces downtime and eliminates frequent disposable battery changes. Versatile lighting for safety: Multiple modes (, medium, low, flash, slow flash, SOS) adapt to traffic, trail, and emergency needs; simple one‑button switching makes operation quick and intuitive. What it does Front and rear illumination: Provides forward visibility and rear signaling to increase your presence on the road or trail. Weatherproof construction: Aluminum alloy casing resists corrosion and impact while meeting IPX5 splash and rain protection for dependable outdoor use. Dependable charging: Built‑in USB rechargeability and fast‑charge support let you up the lights from a power bank, computer, or wall adapter. How it solves common problems Eliminates foggy, unreliable lighting in wet weather with a waterproof, corrosion‑resistant design. Removes the hassle and expense of disposable batteries by using a USB‑rechargeable system with faster recharge times. Improves rider safety by offering multiple brightness and signaling modes for different visibility situations. Features at a glance Compatibility: Merida Reacto 4000 (2021) Material: Aluminum alloy housing Waterproof rating: IPX5 Power: USB rechargeable battery with fast charging support Lighting modes: , medium, low, flash, slow flash, SOS Controls: Simple button operation for easy mode switching Function: Headlight (front) and taillight (rear); can serve as an emergency flashlight Practical use scenarios Commuting in mixed weather: Recharge before your commute and rely on IPX5 protection and multiple modes to stay visible during rainy mornings or evenings. Late‑afternoon training rides: Use the or medium beam for forward visibility on rural roads and the rear flash mode to alert passing traffic. Emergency roadside use: Switch to SOS or steady beam to signal for help or illuminate a after dark. Trustworthy design Built from robust materials and matched to the specified Merida model to ensure fit and performance without unnecessary features. Simple controls and USB charging make these lights practical for daily riders and occasional adventurers alike.