Voltage:12V DC;Connection size:23mmx15mm(0.9″x0.59″) Replacement for most Scooters/Mopeds/Dirt Bikes/Go Karts/Gas Scooter/ATV with GY6 50cc to 150cc motors Brand new 12V 4 Pin motorcycle Dual-siliconfull wave voltage regulator.made of dual-silicon wafers The regulator rectifier use voltage from magneto to charge battery and provide enough electrical power for vehicle output,meantime the output voltage is automatically adjusted Warranty:We are always available to help our customers.Please message us for replacement or refund if you are not satisfied with the order pls confirm The size of the product meets your requirements before you purchase Note:please allow 0.5-1 inch difference due to manual measurement.1inch=2.54cm Feature: High class quality and very durable Prevents over charging battery and improve charging capability Heat sink fins for better cooling Easy to install,just replace and ride No assembly required Higher grade of electronic components Improved heat sink and charging