1IPX4 WATERPROOF: Night running light offers IPX4 waterproofing, so you don't have to worry about being stuck in a dark, rainy day with no visibility. 2SWIVEL LIGHTING: Chest running light supports rotating lighting that allows you to see far enough ahead to avoid hazards on the road. 3COMFORTABLE FIT: LED running light comes with an adjustable length flexible fastening strap that provides a comfortable fit for most different body types. 4ADJUSTABLE: Chest light supports 120 degree angle adjustment (60 degree up, 60 degree down), which can illuminate the ground and slope well and reduce the reflected glare to the eyes. 5USB RECHARGEABLE: LED chest lamps come with a micro USB charging cable and take about 5 hours to charge. Suitable for outdoor cycling, camping, hiking, etc.