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This is the Futaba G190 Micro Piezo Gyro.

FEATURES: Integrated sensor type rate gyro is designed for small electric
            powered helicopters
          Any side of the gyro case can be used to mount unit to heli-great for
            limited space applications
          High density assembly technology results in small size and light
            weight

INCLUDES: One Futaba G190 Micro Piezo Gyro
          One mini plastic screwdriver
          Three pieces of double sided tape

REQUIRES: Micro servo like the Futaba S3108

SPECS:    Length: .87" (22.2mm)
          Width:  .90" (22.8mm)
          Height: .35"  (8.9mm)
          Weight: .24oz (6.7g) including connector
          Operating Voltage: 4.8 to 6V DC
          Current Drain: 15mA @ 4.8V
          Operating Temperature Range: -5°to +45°C
          Functions: Sensitivity trimmer and LED monitor
          Gyro Sensor: Piezoelectric
          Functions: Sensitivity trimmer and LED monitor
         Voltage- use only with a 4.8V battery. (if you use it with a
           higher voltage battery it needs to be regulated to 6V)