LED armband 1)Material:TPU,ABS,LED,PET. 2)battery incl:2pcs*CR2032 lithium batteries. LED armbandMaterial: TPU,ABS,LED,PET,Reflected Material,the Reflected ... life: The 3V&230mAh battery can last for 60 hours for long lighting and 80hours for flashing and can be replaced after it ... certification,EN471 water proof.This product can be used in running outdoor sports,bar,disco,season greeting in a dark or ...