Description： 1. Using the I2C interface do not use the GPIO interface (default address is 0x6F). 2. Supports raspberry pi faction (3.3v level) and arduino (5v level). 3. Supports 16 channel PWM channel output you can control 16 channel servos or LED. 4. 12 bit resolution adjustable PWM frequency is up to 1.6KHz. 5. 3P standard interfaces to connect servos and LED. 6. 4 bit Adjustable address (A0-A3) to facilitate cascading expansion board up to 16 expansion board (256 servos or LED can be controlled). Features: 1.DC 4.5V~5.5V DC for Servo. 2.Control channel: 16. 3.Input: I2C. 4.Output: PWM (up to 1.6KHz).