1, cloth badge 2, competitive price 3, strong battery good quality 4,CE. Rohs certification 5, welcome order cloth badge 1, switch: button switch, screw switch2, Pins: Needle pin, Butterfly pin, Magnetic attach. also a line on your necklace3, OEM service, could do every design which you want. welcome to your logo4, LED color for your choose, Red, Yellow, Blue, Green Jade..5, Size: 3cm-10cm6, ...