Features:High quality water repellent fabric with good water resistance and effective in preventing rainwater.Removable remote control design,simple and compact,easy to use.LED remote control warning backpack is like traffic lights.when you want to turn left or right or stop,a corresponding singnal will be sent by remote control.Whenever you ride in the day and at night,warning lights will keep you safer by reminding people around you.Easier operation and safe,fashionable style and unique appearance get you outstanding.Specifications:Material:NylonColor:Yellow/Dark GraySize:Approx.Lower width:130mmUpper width:180mmHeight:170mmPower supply method:Lithium batteryRemote control power supply:2 button batteries(included)Interface: USBCommunication Mode:Wireless Frequency 2.4GHZPackage included:1 remote control1 instruction manual1 remote control deduction1USB charging cable4 cable tieNote:1. Due to the light and screen difference, the item's color may be slightly different from the pictures.2. Please allow 0.5-2 cm differences due to manual measurement.