Please Notice: The size of G4 based led bulb is 12mm*37mm, which is a litter bigger than the normal G4 halogen bulbs; the G4 led bulb is non-dimmable, only use the stable 12V, not suitable the dimmer switch or will cause the lights flicker or noise; The G4 bulb have anode and cathode, please install it correctly Save Money: abtong G4 bulb can replace 20W halogen bulb, save up 85% energy bill, brighter and safer than normal halogen bulbs High Performance: 360 degree directional, 3500K warm white, plastic transparent cover, high clearly and anti-pressure, heat and impact resistant Application: Standard G4 BI-PIN base, great idea for landscape lighting, lawn lights, puck lights, under cabinet lighting, under counter lights, post lights, recessed light and etc Service: Any issue, please feel free contact customer service, we will give you a satisfied solution