Size: armband length: 35CM, width 2.5CM Color: blue, green, red(optional) Material: nylon webbing + LED electronics LIGHT POWER ENOUGH: The strong luminosity makes you more visible in twilight and rainy weather. Best protection in the dark. RECHARGEABLE TAPES: The battery does not need to be replaced, the tapes can be easily charged with the included charger. 3 LIGHTING MODES: It has 3 modes, slow flashing, fast flashing and steady light. This can be easily set using the button. UNIVERSAL APPLICABLE: Suitable for jogging, running, cycling, night hiking, mountaineering, dog walking. More security on the way. ADJUSTABLE SIZE: Adjustable strap (28-32cm) is ideal for adults and children. The Velcro fasteners hold tight and do not slip down. LIGHT POWER ENOUGH: The strong luminosity makes you more visible in twilight and rainy weather. Best protection in the dark. RECHARGEABLE TAPES: The battery does not need to be replaced, the tapes can be easily charged with the included charger. 3 LIGHTING MODES: It has 3 modes, slow flashing, fast flashing and steady light. This can be easily set using the button. UNIVERSAL APPLICABLE: Suitable for jogging, running, cycling, night hiking, mountaineering, dog walking. More security on the way. ADJUSTABLE SIZE: Adjustable strap (27-31cm) is ideal for adults and children. The Velcro fasteners hold tight and do not slip down. Package Includes: 2 x LED Armband