L'antre Du Dingo does a review of the chrono from an already familiar name in Airsoft, Acetech. In this review he checks out the AceTech AC6000BT Chrono which has a rechargeable battery and packed with features such as measuring muzzle velocity, rate of fire, energy, and 25 shot memory slots. It has a bluetooth feature so you can connect wireless to the AceTech mobile app as well as a tripod mount. Package usually comes with a premium zip up case.