Built in digital display for easy step by step instructions. Uses laser alignment technology - no alignment visor needed. Meets or exceeds SAE J-599 and J-600 specifications, approved in all states and Canada. Uses rechargeable Ni-Cad batteries. Easy to use, simple three step aiming process The award winning Hoppy Vision 100 Photometric Aimer is the aimer of choice among automotive technicians. It's dependable, easy to use and affordable. The Vision 100 is portable and is designed for multiple bay use with minimal adjustments required. This state of the art aimer is constructed of the highest quality materials, and workmanship, that you have come to expect from American Aimers.