The current version of the controller is version 3.1，They normaly come with the bootloader on<br />the chip and you just need to upload the firmware via micro USB.<br /><strong>Features:</strong><br />Brushless Gimbal Controller 3.1<br />Micro USB connector (no FTDI needed)<br />Stabilized VBUS (USB port)<br />Pin layout optimized GND， A1 and A2 GND， multi-port， 5V<br />L6234 brushless motor driver<br />2 outputs for brushless motors<br />4 receiver inputs<br />6 analog inputs<br />Serial port available<br />Power LED (blue)<br />Small LEDs on the USB<br />Dimensions 50 mm x 50 mm<br />Standard MK style mounting holes 45 mm x 45 mm<br />2 instead of 4 glass diodes SOT23<br />5V better stabilized<br />Shifter lever on the I2C Bus (3.3V to 5V)<br />Pull reduced (for better edges)<br />MPU6050 3 Sensor module<br />Chip: MPU-6050<br />Power supply: 3-5V<br />Gyroscope range: + 250 500 1000 2000 ⊂/ s<br />Acceleration range: ≤ 2 ≤ 4 ≤ 8 ≤ 16 g<br />Communication: Standard IIC communication agreement<br />Chip built-in 16 bit AD converter， 16 bits of data output<br />Pin Pitch: 2.54mm<br />Size: 20.3mm x 16.5mm<br /><br /><strong>Specification:</strong><br />Package size: 5 * 5 * 1cm / 2 * 2 * 0.4in<br />Total weight: 17g / 0.6oz<br /><br /><strong>Package list:</strong><br />1 * Brushless Gimbal Controller 3.1<br />1 * MPU6050 Sensor<br />1 * cable