Holds 4 x 1.5V AA Batteries, Provides 6V Output When Used With Alkaline Batteries, 4.8V When Used With Rechargeable AA Holder Made Of ABS Plastic With Nickel plated springs to hold the batteries tight in place Standard snap connector on one end. For use in Educational, Hobbiest or Replacement projects. Great 4 AA battery holder for your Arduino project! Provides 6V output when used Alkaline batteries, 4.8V when used with rechargeable AA. These AA battery holders feature a standard snap connector on one end. The case is made from ABS plastic with nickel plated springs to hold your AA batteries in place. Each battery holder measures 4.375" x 1" x 0.675"( L * W * H ). AA batteries in these holders will last much longer than a standard 9V battery will when powering up electronic projects. AA batteries not included. Ideal for use as a replacement battery holder in the Garrett GTA, GTAx, GTX, GTP and GTI Series metal detectors.