A injection device includes: a hub two wings extending from the hub and functioning as flashing indicators a tube connected to a first end of the hub a needle being in fluid communication with the second end of the hub and a check valve is provided within the tube, wherein a fluid can flow from the tube to the hub through the check valve, and the fluid is prohibited from flowing from the hub to the tube by the check valve. The flashing indicators can be observed by a user to make sure that the needle has been properly inserted into a vein.
