4.2 automatic luminous crossbow tail plus 4 bushing

Usage size: suitable for 338/504 pieces of aluminum carbon arrow shafts with an inner diameter of 4.2MM.

Description: This is a luminous tail with a size of (4.2mm) LED string automatically lighting up the luminous tail, 

and the double card slot string automatically lights up the luminous tail.

The arrow is set up and the string automatically lights up when it enters the firing switch card slot at the moment 

of shooting, which solves the trouble of lighting up the tail before shooting and saves power.

Battery capacity: The manufacturer promises that it can be used continuously for 36 hours