Needle is concealed before and after use. It is automatically rendered inoperative after a single use. No arming is required and the lancets are color-coded. for easy recognition. The lancet is triggered by a gentle push on the test site area, giving optimum blood flow at shallow depths. High-speed penetration minimizes pain. The hidden needle and quiet operation helps increase patient comfort. Needle, 1.8mm Depth, 10 to 20uL Blood Sample, Gray