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Dimensions (no headers or terminal block) 2.5inch x 1inch x 0.1inch(62.5mm x 25.4mm x 3mm).This board/chip uses I2C 7-bit address between 0x60-0x80,selectable with jumpers Terminal block for power input(or you can use the 0.1inch breakouts on the side)Reverse polarity protection on the terminal block input.Green power-good LED.3pin connectors in groups of 4 so you can plug in 16 servos at once (Servo plugs are slightly wider than 0.1inch so you can only stack 4 next to each other on 0.1inch header Chain-able design A spot to place a big capacitor on the V+ line(in case you need it)220 ohm series resistors on all the output lines to protect them, and to make driving LEDs trivial Solder jumpers for the 6 address select pins. i2c-controlled PWM driver with a built in clock. Unlike the TLC5940 family, you do not need to continuously send it signal tying up your microcontroller, its completely free runningIt is 5V compliant, which means you can control it from a 3.3V microcontroller and still safely drive up to 6V outputs (this is good for when you want to control white or blue LEDs with 3.4+ forward voltages).6 address select pins so you can wire up to 62 of these on a single i2c bus, a total of 992 outputs - that's a lot of servos or LEDs.Adjustable frequency PWM up to about 1.6 KHz 12-bit resolution for each output - for servos, that means about 4us resolution at 60Hz update rate , Configurable push-pull or open-drain output ,Output enable pin to quickly disable all the outputs.Colour:As shownMaterial:PC+MetalPackage Contents:2 x PCA9685 16-Channel 12-bit PWM Servo Motor Driver I2C Module for Arduino RobotOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.