Features: Identification marker light,tacticals signal light with three modes of operation: alway on,flashing turn off. Quality ,helmet flashing light be made from good quality plastic which with good sealing (waterproof) and flexibility. Powerful function,this tacticals signal light is an essential item for your outdoor activities, such as cycling, hiking, hunting, diving. you can stick it on your tacticals helmet, hangs it on it on your backpack, stick on your bicycles seats or hangs on your neck. Attention,when the battery is exhausted, you can replace the battery. (but changing the battery will affect the waterproof function of the product.) Wonderful gift,sweet warm gift for friend family or yourself Specifications: Material:Plastic Light Color:1,2,3,4 Sheel:Black,Sand Package Includes: 1 Piece Personals Identification Marker Light note: Please allow 1-2cm errors due to manual measurement,please make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.