High-Quality White 3V/4.5V/6V E10 DCLED Small Bulb Torch 180LM Replacement Bulbs
Running Light for Runners Chest LED Lamp Waterproof Jogging USB Flashlight Torch. 3V 4.5V Positive (+) on the bottom and negative (-) on the side. 3W 6V does not need to distinguish between positive "+" and negative "-".