High-Voltage Brushless Servo or HBS for short combines the performance of brushless technology with all the advantages of the high-voltage servo. In addition to the unparalleled acceleration, greater efficiency, and no wear of carbon brushes, these servos can be supplied with an operating voltage up to 8.4V.

Direct connection of 2-cell LiPo battery packs is now possiblewith no problem; in addition, these servos also provide top performance at an operating voltage of just 6V.
Precision manufacturing and assembly and top component quality provide the servo drive system with uncompromising power and speed. A new dimension in the combination of power, speed, acceleration, precision, and resolution.

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GM7990 High Voltage Brushless Servo HBS 860 BB MG

Suitable for many applications but especially good for 4WD Off Road.

FEATURES;

Brushless
Digital
High Voltage upto 8.4v
Twin Ball Bearing
Metal Gears
High quality rubber seals
SPECIFICATION;

Holding Torque – 29.5 kg/cm @ 7.4v
Speed – 0.11/40deg @6v
Operating voltage – 4.8 – 8.4v
Dimensions (LxWxH): 40 x 20 x 40 mm
Weight – 68g
Torque – 15.3 kg/cm @7.4v

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GM7991 High Voltage Brushless Servo HBS 870 BB MG

Suitable for many applications but especially good for 2WD Off Road

FEATURES;

Brushless
Digital
High Voltage upto 8.4v
Twin Ball Bearing
Metal Gears
High quality rubber seals
SPECIFICATIONS;

Holding Tourque – 26.5 kg/cm @ 7.4v
Speed – 0.09/40deg @6v
Operating voltage – 4.8 – 8.4v
Dimensions (LxWxH): 40 x 20 x 40 mm
Weight – 68g
Torque – 13.3 kg/cm @7.4v

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GM7987 Hi Voltage Brushless Servo HBS 790 BB, MG

Ideally suited for Touring Cars and small space applications.

FEATURES;

Brushless
Digital
High Voltage upto 8.4v
Twin Ball Bearing
Metal Gears
High quality rubber seals

SPECIFICATION;

Holding Tourque – 15.3 kg/cm @ 7.4v
Speed – 0.055/40deg @6v
Operating voltage – 4.8 – 8.4v
Dimensions (LxWxH): 40 x 19,5 x 25,5 mm
Weight – 43g
Torque – 7.1 kg/cm @7.4v

Source:  Schumacher