This is the Savox SW2290SG-BE Waterproof Premium Brushless Digital Servo, a powerful "Monster" performance series from Savox that utilizes an all aluminum case, unique brushless motor and controller technology to boost power up to 35% over previous generation servos.  

Features:
Waterproof (IP67)
Full Aluminum Case
3 Precision Ball Bearings.
Unique steel gears
Specifications:
Torque @ 6v: 45.0kg/624.9oz-in
Torque @ 7.4v: 55.0kg/763.8oz-in
Torque @ 8.4v: 70.0kg/972.1oz-in
Speed @ 6v: 0.16 sec/60 deg
Speed @ 7.4v: 0.13 sec/60 deg
Speed @ 8.4v: 0.11 sec/60 deg
Dimensions: (LxWxH)(mm): 40.3x20.2x38.7mm
Weight: 81g
Operating Temperature: 14° - 122°F (-10° - 50°C)
Running Current (no load): 180mA @6.0V, 220mA @7.4V, 220mA @8.4V
Stall Current (at locked): 7500mA @6.0V, 9200mA @7.4V, 10500mA @8.4V
Idle Current: 5mA @6.0V, 5mA @7.4V, 5mA @8.4V
Wire Length: 300 +/- 5mm
Output Gear Spline: 25 Tooth
Bearings: 2BB
Operating Travel: 100° (1000 ? 2000 µ second)
Neutral Position: 1500 µ second
Pulse Width Range: 800 ? 2200 µ second
Maximum Travel: Appx 130° (900 ? 2100 µ second)
Refresh Rate: 333 Hz
Motor Type: Brushless