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

Function
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

SPECS:
Length: 0.87" (22.2mm)
Width: 0.90" (22.8mm)
Height: 0.35" (8.9mm)
Weight: 0.24oz (6.7g) including connector
Operating Voltage: 4.8 to 6V DC
Current Drain: 15mA @ 4.8V
Operating Temperature Range: -5¢Xto +45¢XC
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)