What you can receive: there are 2 pieces of flash strobe controllers and 2 pieces of double sided adhesive tapes in the package, which can alert the vehicles behind you to stop to avoid rear-end accidents when driving blocked roads; Sending them to your friends and family members is also a good option 2 Flash speeds: when braking, this brake light flash module can first fast-blink 4 times and then slow-blink 4 times, and finally stay in the original steady light when flashing is completed, which can warn your following drivers when you stop with a catchy blinking light Serviceable material: the car flasher modules are made of quality ABS material, sturdy and reliable to use, not easy to wear or tear, can be kept and applied for a long time; They also adopt complete sealed technology, which can protect modules from water and avoid short circuit, giving you a satisfactory using experience Simple installation: the flash module measures about 4.8 x 2.7 x 1.4 cm/ 1.89 x 1.06 x 0.55 inches, 15 cm/ 5.9 inches in wire length, and comes with double sided adhesive tapes for easy installation; You only need to connect red wire to positive pole, and black wire to negative pole, very easy and convenient, and it's suggested to install it in the third brake light Wide range of applications: these car brake light flashers can enhance your brake light function, are necessary assistants in your daily life, can be widely applied to all types of cars' brake lights with 12 to 30 V, such as cars, trucks, motorcycles, electric bicycles and more