1、Size Adjustable: The LED sports armband has a dimension of 1"x 178", just simply adjust the night running gear to proper length and button up to use. It’s lightweight and comfortable for adult, children or pet.  2、High Visibility: The glow band is designed to give you 360 degree ultra-high visibility in the dark, which has higher brightness than the glow sticks, ensuring greater safety for you, your children or your pets at night from careless and distracted drivers.  3、Water and Sweat Proof: This LED light up band is made of nylon fabric and special waterproof LED materials that protect your armband from water or sweat, so there is no need to worry about the electric leakage and short circuit, ensuring greater safety. 4、USB Charging: Powered by 2PCS CR2032 replaceable batteries, the flashing wristband can work for about 40~50 hours. And we specially provide an USB charging cord for the sports bracelet. It’s convenient for recharging after wristband running out of battery power. 5、Suitable For: This LED armband is perfect for running, jogging, cycling and more outdoor sports. 2 pcs LED Armbands Material: nylon webbing + LED electronics Size: Armband length: about 32cm / 12.6inch, width: about 2.5cm / 0.9inch, adjustment: about 28cm-32cm / 11.0- 12.6inch Blinking mode: long light, fast light, slow light (control by switch) Rechargeable, equipped with 1 LIR2032 rechargeable battery, it can be used for 3-4 hours on a full charge. Lighting time: 60-80 hours, normal use for 2-3 months; battery can be replaced by yourself Suitable for: outdoor sports, night running, large festivals, concerts, employee benefits, company large events, etc.