Features 1、Bowstring Activation Switch: When shooting, the bowstring touches the lighted nock to light up instantly. When not in use, the lighted nock is turned off immediately when the finger is moved. 2、Applicable: This automatic archery lighted nocks fit most standard arrowheads with an inner diameter of 6.2 mm. 3、Exceptional Accuracy: The archery insert lighted nock is lightweight and accurate balanced for exceptional accuracy. 4、Long Battery Life:The battery of the nock tail can work continuously for more than 48 hours, and the battery life is long enough to ensure that you will not lose your target because the power will not be cut off during the hunting process. 5、LED Lights: The nock is made of transparent plastic, the LED lights are bright enough, and the very high visibility makes it easy to find the arrow even at night, ensuring your mobility at night. Specification Item Type:Archery Lighted Nocks Material: Plastic Gross Weight: 17g/0.6oz Battery Type: 1 CR425 button battery Battery Capacity: 25MAH, shipped with built in battery Features: Auto illuminated nock with switch, easy to operate Package List 3 x Archery Lighted Nocks