BRIDGESTONE Science Eye Science Eye HD-01 Head Speed Measuring Device Power confirmed Note: Batteries are not included. Requires 4 AAA batteries. Comes with a bonus balance chip! Will be shipped in simple packaging. The photos show everything included. No discount "Not Discount" Due to rising logistics costs, we ask for your cooperation in not negotiating discounts. As this is a used item, please check the images for scratches and dirt, and only consider purchasing if you understand that it is a USED item. Please assume that anything not described is unknown, and as we do not have complete specialized knowledge, please judge from the photos. Also, please refrain from purchasing if you are overly concerned or sensitive. Discounts are available only for those who purchase multiple items!!