. M-31A is one lamp flashlights color are red, yellow, green, etc. I.C function 1. Constant light 2. Flash battery 3v li-battery. . M-328W is three lamps PCB plate the I.C. function are 3 section 1. All flash 2. Random flash 3. Constant light 4. Off . 2032 li-battery x 2 (6v) . M-34 are 3 pcs 2.8 mm R/Y/Y-G lamp I.C. function one touch three time run, general use shoe lights Cell battery 10 x 2 (3V) Quantity Per Month: 50 K PCS Delivery Way - Date Of Delivery: 30 days