There are two models of T20 turn signal lamp, W21W and W21 / 5W. The power of W21W is 21W, and the bulb diameter is t20-t25, which can also be called 7440. W21 / 5W power is 21W and 5W, also known as 7443. Commonly used models such as Jeep Orland. It can be used as front turn signal or rear turn signal lamp. It is mostly used in Japanese models.