Flashing details: Flash 3 times in 2 seconds for brake light mode, then keep steady lighting on.

• 【Ultra Bright】- Each 7440 7443 LED bulb utilizes high power 3030 SMD & 4014 SMD Chips- 300% brighter than halogen bulbs. 1200 Lumens per bulb with 360 degrees of illumination, 2400 lm of 2 bulbs. Ensure sufficient illumination brightness and distance, the warning effect is more obvious
• 【As Brake Lights & Tail Lights, 】- This 7443 LED bulb red Flashing Strobe Blinking Brake will fast flash 3 times at the beginning braking mode for much easier notification and safer stop & then turn stable solid brake light (Legal blinking times) to avoid any automotive cars, trucks, SUVs, RVs rear-end collision

• 【Longer Lasting】- Low power consumption & Built-in intelligent IC driver for a longer lifespan. Full aviation aluminum material with a hollow design for better heat dissipation and safer working. The service time of the T20 W21W LED bulb could last up to 50,000 hours.
• 【Easy to Install】- Non-polarity design. Plug and play. Compatible with both CK/SRCK and standard sockets.
• You needn't worry whether you have a CK or Non-CK socket, these bulbs are universally compatible. They will fit into the same socket as your OEM original bulbs have No electromagnetic interference, and have No need to consider polarity while installing, 1-inch design makes sizing comparable to halogen bulbs and fits perfectly in your vehicle. Truly plug & play
• 【Specification】- Working Voltage: 9-18V DC; Size: 1.70 x 0.79 x 0.79 inch; Current-Output: 0.5 A; Wattage: 7W/Bulb; Light Color: Brilliant Red.   
• 【Cross Reference Number】- 7440, 7441, 7443, 7443LL, W21/5W, 7443/26201, 78660, 78661, 17919, 7515, HIB7443WM, W21W, 7440/26200, 17632, 7504, 7440LL, 7443-SRCK, 7443-CK, etc