3pcs Top Quality Bow String Activated LED lighted Nock Compound Bow Nock For ID 6.2mm Archery Hunting Arrow Accessory 

Feature:

About 30 hours of battery life(non-replaceable)

Bowstring Activated On-off Switch

Waterproof and shock resistant

No assembly required

Lightweight and precision-balanced for superior accuracy.

Fits most standard arrows.

Color:Green

Weight:20 grain

Material:Clear plastic + LED stick

fit for  ID 4.2 5.2 6.2  7.6 mm  arrow nocks 

Packing: 3pcs lighted nocks

 

How to use:

Nocks can be inserted to the shaft easily and in fully operational condition.