5 Lighting modesThe Bike Taillight has 5 lighting modes: quick flash/slow flash/warning lights flash/strong light/weak light. A variety of selection modes for you to choose, you can choose your favorite mode for night riding. MultifunctionThe Bicycle Signal Light is designed to remind other pedestrians and drivers to keep distance and illuminate heading way on night cycling. Power supply modeBike Rear Light power supply mode: Built-in rechargeable lithium battery, USB charging mode can be convenient and practical. Easy to installThe Bike Taillight is easy to install: with an adjustable fastening belt, simple installation can be finished quickly, it is easily loosened and secured without any tools. Suitable situationSuitable situation: safe riding at night with this bicycle alarm tail light. Features: 1. It has 5 lighting modes: quick flash/slow flash/warning lights flash/strong light/weak light. A varietyof selection modes for you to choose, you can choose your favorite mode for night riding. 2. Designed to remind other pedestrians and drivers to keep distance and illuminate heading way on night cycling. 3. Power supply mode: Built-in rechargeable lithium battery, USB charging mode can be convenient andpractical. 4. Easy to install: with an adjustable fastening belt, simple installation can be finished quickly, it iseasily loosened and secured without any tools. 5. Suitable situation: safe riding at night with this bicycle alarm tail light. Specification: Condition:100% Brand New Material: ABS Color: As Pictures Shown Charging Time: 1.5hours Led Color: Red Yellow Color Power supply type: Built in 250mah polymer lithium battery Lighting gear: 5 gears Applicable Occasion: bicycle night riding tail warning Mode: Quick Flash/Slow Flash/Warning Light Flash/Strong Light/Weak Light Long press switch: OFF Waterproof Grade: IP63 Size: approx.59.5*28.5mm/2.3*1.1in Weight: Approx.60g Package list: 1 * Bicycle Tail Light 1 * USB Cable 1 * Fastening Belt