Specifications: The PCA9685 chip is wrapped in the middle of the small board. It has power, green power. It is convenient for you to insert 16 servo motors in 4 groups of 3-pin connectors at a time (the connector on the servo motor is slightly wider than 0.1", so you can insert 4 pairs of 0.1" connectors. Reverse polarity protection for the input on the terminal block. Put a large capacitor on the V+-line (you will need it in some cases). The maximum external input voltage depends on this 10V1000uf capacitor. A 220ohm series resistor is placed on all PWM output lines to protect them and can easily drive the LED.Type: PCA9685 Drive ModuleVoltage: DC5-10V power : IICMaterial: PCBFeatures: , Useful, Easy to Install Size: 2.5cm x 6.1cm / 0.98" x 2.4" (approx.) Notes: Due to the difference between light and screen settings, the color of the item may differ slightly from the pictures. Please allow a slight difference in dimensions due to different manual measurements. Package includes: 1 x PCA9685 Drive Module