This is the HS-805MG Analog Mega Scale Servo from Hitec.

FEATURES: Dual ball bearings Durable metal gears Heavy duty horn and hardware set Water and dust resistance

INCLUDES: One HS-80MG Mega Scale Servo with Preinstalled Round Servo Horn One Y-Harness Four Rubber Grommets Four Brass Eyelets Four 2x15mm Flanged Button Head Screws One One-Armed Servo Horn One X-Shaped Servo Horn

SPECS: Operating Speed: 0.19sec/60° at 4.8V 0.14sec/60° at 6.0V Output Torque: 19.8kg-cm (275oz-in) at 4.8V 24.7kg-cm (343oz-in) at 6.0V Weight: 197g (6.95oz) Size: 66 x 30 x 57.6mm (2.59" x 1.18" x 2.26")

COMMENTS: Must be used with at least a 1200mAh NiCd/NiMH Battery (5-6 cells) Power must be fed directly to the servo without going through the B.E.C. regulator  

BOX DIMENSIONS: 3.00" W. X 2.00" H. X 3.75" L. BOX WEIGHT: .52 LBS.