This is the Futaba GY611 Gyro with the BLS251 Brushless Motor Digital Servo.

FEATURES - GY611:

• Super narrow pulse drive system substantially improves servo response
• Microcomputer high-speed arithmetic processing substantially improves gyro response
• High-resolution 12-bit A/D (Analog to Digital) accurately converts sensor output to a Digital Signal
• SMM (Silicone Micro Machining) micro-machining mechanical parts and systems right on a silicone chip and also low-back aeroform case improves vibration resistance and neutral characteristic
• AVCS (Angular Vector Control System) (same as Heading Hold) system requires a high-precision angular velocity detection function and extremely small output drift by using a new type of gyro sensor. This minimizes rudder neutral position drift during flight and eliminates the need to trim the rudder during flight.

FEATURES - BLS251 :

• Equipped with a Brushless motor that lasts longer and operates at alower temperature than Brushed motors
• Compatible with Futaba GY601 and GY611 gyros
• Samarium Cobalt magnets and dual ball bearings
• Same power consumption and centering as Digital servos equipped with Brushed motors
• Standard size

INCLUDES: Futaba GY611 sensor, control amp, BLS251 servo, mini screwdriver, 3 sections double sided tape and instruction sheet

SPECS:
GY611 Ratings: Yaw-axis stabilizer for helicopter (rate gyro)
Display Device: 8-character dot matrix Liquid Crystal Display
Operating Voltage Range: DC 3.8V to 5V
Current Drain: 70mA @ 5.0V, including sensor
Dimensions: Amp 2.2"x 1.2"x 0.59" (57 x 32 x 15mm)
Sensor 1.2"x 1.2"x 0.71" (30mm x 30mm x 18mm)
Weight: Amp 1.19oz (34g); Sensor 1.05oz (30g)

BLS251 Servo Ratings:
Dimensions: 40 x 20 x 36.8mm
Weight: 61g
Speed: 0.06sec/60º (at 4.8V )
Torque: 3.8kg-cm (at 4.8V )