Upgraded version of the switch, more stable to use, will not Automatically turn on when you ; Push up by hands without dismantle if you to turn off With lithium batteries perfect for hunting at dusk with 48+ hours of battery life, to your arrows at night or daytime Designed for greater efficiency in low light, enhanced precision, and vastly improved retrieval,Help you take aim at improving your archery accuracy Flashing high-visibility light makes it easier to find your Work for: Aluminum shafts & carbon shafts & glassfiber shafts.<br> Material:PC colour:red Package Contents: 3 x 4.2mm luminous nock 3 x 5.18mm conversion ring 3 x 6.2mm conversion ring Only the above package content, other products are not included.<br> Note: Light and different displays may cause the color of the item in the a little different from the real thing.<br> The measurement allowed error is +/- 1-3cm.<br>Note: <br>1. Please allow 1-3 mm error due to manual measurement and 1-3g weight error make sure you don't mind before ordering. <br>2. Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please make sure you don't mind before ordering, thank you!<br>About Shipping: <br>1.please pay attention to your delivery address such as: name, street, house number, doorbell/email without name, etc. is correct, or the order will not be delivered correctly.<br>2.All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances.<br>3.During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 24 hours, wish you a happy shopping!