Check the listing for details. FIRENOCK Target circuit (KR) for A / E style nock or A3 /E3. Color: Red, Condition: New. Listed at 35.95 USD. Brand New FIRENOCK Target circuit (KR) for A / E style nock or A3 /E3Custom accessory for Firenock A3 / E3 lighted nock pack See Firenock lighted nock on youtube (just input " firenock nock") Features:once shot solid lit for 17 seconds and then auto LED off by itselfUSA made G switch technology, LED activates when it is shot (No actuator magnet is needed)ultra bright LED (up to 11,000 LUX focus-beam LED)24K Gold plated connector for best reliability and corrosion resistanceblood proof / water proof designwill fit Firenock A / E style nockContents:3 pcs Target circuits with Red LED Notes:- Extreme shock end cap (XA / XE, sold separately) is required if shooting into hard objects or over 290fps- For best performance, please use Firenock battery pack (sold separately)