Feature: Power supply: powered by 2 CR2032 button batteries （INCLUDED） Function mode: Press the 1 button to light up, press the 2 button to flash "SOS" Product use: Tied to the arm or tied to the leg to make your night riding and night running or walking safer occasions: running, walking, outdoor activities, cycling, Also suitable for pets Material: Silicone Weight: 65 grams color: green,red,blue,yellow,orange,pink Size: product expansion 40-50cm folding length 18.5*2.5cm Package included: 1 pcs