5 to 30V positive gound or negative ground non polarity. P45t base. Made with 16 Cree 2525 LEDs. Dual filament the low beam Lumens up to 1200. The high beam Lumens up to 1800. Long life 30,000 hours. Made with alumunim for long life. Uses only 800mA. Constant current led driver to reduce flicker. CE and Rohs listed. The base is P45D. This led bulb is for old vintage and classic cars, trucks, motorcycles and scooters. Long life up to 30,000 hours. 8 LEDs on each side for best illumination. When looking at the connect from the rear the ground is the left most contact. The center contact is the low beam. The right most contact is the high beam. Fits 34265 socket for easy wiring.