This is an adapter for converting Four Thirds mount lenses with electronic contacts to Micro Four Thirds mount. It has a tripod socket. It's in beautiful condition as it has hardly been used. It's the same as the one sold on Amazon as: "OEM 4/3 (AF) 4/3 to M4/3 Camera Adapter Ring Autofocus Lens Mount 4/3 Mount Lens to Olympus M4/3 Mount Lens Camera Olympus E-P1 E-P2 E-PL1 E-PL2 Panasonic G1 G2 G10 GF1 GF2 GF3 for Olympus."