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