1. Works with official Arduino boards 2. This is an I2C controlled PWM driver board with a built-in clock 3. You can use 3.3V MCU to control and drive the output up to 6V 4. 6 address select pins allow you to connect 62 driver boards to one I2C bus, total 992 channels of PWM output 5. About 1.6KHz frequency modulation PWM output 6. PCA9685 chip is at the center of the board 7. With power input terminal 8. With green power indicator light 9. Convenient to insert total 16 servos at the same time 10. With reverse polarity protection for input 11. Cascade design 12. Put a bulky capacitor on the V+ line 13. Put 220 ohm resistance components onto all PWM output lines

http://olla.gr/16-channel-pwm-servo-motor-controller-diy-for-arduino/