This is a Futaba BLS373SV S.Bus2 High-Voltage Brushless High-Torque Surface Servo.
Specifications:
Speed | 0.14 sec/60°at 6.0V |
Torque | 31 kgf/cm at 6.0V 37 kgf/cm at 7.4V |
Dimensions | 40.5 x 21 x 40 mm |
Weight | 84 g |
Rated Voltage | DC 6.0V-7.4V |
Operating Voltage | DC 4.0-8.4V |