Features 1、SAFETY: The strong luminosity makes you more visible in twilight and rainy weather. The best protection in the dark. 2、3 LIGHTING MODES: It has 3 modes, slow flashing, fast flashing and steady light. You can easily set this via the button. 3、ADJUSTABLE: Adjustable Band is ideal for adults and children. The hook and loop fasteners hold tight and do not slip down. 4、USB RECHARGEABLE: The battery does not need to be replaced, the straps can be easily charged with the included charging cable. 5、UNIVERSAL: Suitable for jogging, running, cycling, night walking, mountaineering, dog walking. More security is on the way. Specification Material: nylon webbing + LED electronics Size: Expanded length: approx. 36.5CM, retracted length: approx. 28.5CM, width: approx. 2.5CM Emitting Color: Red / Orange / Yellow / Green / Blue / Pink Blinking mode: long light, fast light, slow light (control by switch) Battery: 1 * LIR2032 coin cell Charging Mode: Once charged, it can be used for about 3 hours Battery Mode: Lighting time: 60-80 hours, normal use 2-3 months; battery can be replaced by yourself. Feature: Splash-proof, washable removable electronics. Suitable for: outdoor sports, night running, large festivals, concerts, corporate events, etc. Package List 4 x Luminous Arm Bands 4 x USB Charging Cable