Note:This bulb is 5W(Canbus) , not for 21W. ( Require load resistors to bypa the error or hyper flash problem if you install this bulb to a 21w bulb) Specifications:Voltage: 12V-24V (Real voltage)Power: 6-7.5W(Real Wattage)Electric current: 0.5- 0.6ASocket Type: (1156-P21W-BA15S) (1157-P21/5W-BAY15D) (1156-PY21W-BAU15S)(t20- 7440)(t20-7443)(t25-3157)Light beads:21* 3030 SMDSuper brightneBrightne:1200Lm Per lightLighting Angle: 360 DegreesLifespan: >80,000 working hour Application: Turn signal lamp ,brake lights, reverse lights, tail lamp, daytime running lightetc.Color:Red , Amber , White Features: *No polarity , easy to install, derectly replace original bulb, plug and play.*New LED (3030 SMD) technology reduces power consumption from 60% to 80%.*High quality aluminum-Rapid cooling .*Condenser lens, focus light more efficient.*Built in high quality intelligent IC board,control the current at a stable rate to protect the original car circuit. Warranty: 24 month Parcel Include 2 Pcs (1 pair) LED Bulbs