Description: The pressure of st will push the light touch the battery, then the nock will be lighted when you shooting! Then you can turn on and turn off the nock directly like the packaging introduction picture (no Tool Required). Glowing arrow nocks, battery capacity can be used continuously 48 hours, the actual use of the first three nights are very bright, the fourth night began to slowly weaken. After the battery is weak, do not throw away the batteries, put some and they can be used for a few more hours. Once the power is completely used up, individually sealed storage batteries can extend battery life. Suitable for both target practice and real hunting! Feature: Battery Life: up to 36 hours Nock size: 7.62mm Color: Green light Quantity: 6/Pack Type: For Crossbow Fit for: Arrow shaft with inner diameter of 7.6mm mix carbon, carbon, aluminum arrow Package include: 6Pcs Green color Lighted Nocks, The pressure of st will push the light touch the battery, then the nock will be lighted when you shooting! Then you can turn on and turn off the nock directly like the packaging introduction picture (no Tool Required). Glowing arrow nocks, battery capacity can be used continuously 48 hours, the actual use of the first three nights are very bright, the fourth night began to slowly weaken. After the battery is weak, do not throw away the batteries, put some and they can be used for a few more hours. Once the power is completely used up, individually sealed storage batteries can extend battery life. Suitable for both target practice and real hunting! 6Pcs Lighted Nocks for Crossbow Led Illuminated Archery Arrows ID 7.62mm/.300" Battery Life: up to 36 hours Nock size: 7.62mm Color: Green light Quantity: 6/Pack