No batteries needed. Power is directly supplied by the diagnostic socket. – Plug & Play, easy to use. – Stand alone, needs no laptop or additional parts to operate. Compatibility: – Works on any Universal OBD2 or EOBD Vehicle. – Supports ISO, VPW and PWM bus systems (no can bus support) – U.S. Models – European – Japanese – Asian – German – Korean, such as: 　GM ’9…