Driver IC: PCA9685; Adjustable frequency PWM up to about 1.6 kHz; 12-bit resolution for each output – for servos, that means about 4us resolution at a 60Hz update rate; Reverse polarity protection on the terminal block input Configurable push-pull or an open-drain output; The output enable pin to quickly disable all the outputs; Terminal block for power input; Green power-good LED 3 pin connectors in groups of 4 so you can plug in 16 servos at once; Chainable design; A spot to place a big capacitor on the V+ line220-ohm series resistors on all the output lines to protect them, and to make driving LEDs trivial.; This board/chip uses an I2C 7-bit address between 0x60-0x80, selectable with jumpers Dimension:- Length: 62mm; Width: 25mm; Height: 15mm; Weight: 10gm