Check the listing for details. Adafruit 16-Channel 12-bit PWM/Servo Shield - I2C interface NEW S12. Condition: New. Listed at 13.49 USD. Adafruit 16-Channel 12-bit PWM/Servo Shield - I2C interface NEW Product detailsMounting TypePlug-inBrandAdafruitVoltage5 Volts, 6 Volts, 3 VoltsThere's an I2C-controlled PWM driver with a built in clock. That means that, unlike the TLC5940 family, you do not need to continuously send it signal tying up your microcontroller, its completely free running!It is 5V compliant, which means you can control it from a 3.3V Arduino 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 stack up to 62 of these on a single i2c bus, a total of 992 outputs - that's a lot of servos or LEDsAdjustable frequency PWM up to about 1.6 KHz12-bit resolution for each output - for servos, that means about 4us resolution at 60Hz update rateRETURN POLICY: Returns will only be accepted if the item is in brand new condition with the original packaging that it was sent to you. If the item has been used it will not be accepted as a return. Returns will only be accepted if the item is unopened. There will be a 20% restocking fee on all returns. COMBINED SHIPPING: WE DO COMBINE SHIPPING IF YOU PUT THE ITEMS INTO THE CART IT WILL AUTOMATICALLY COMBINE AND DISCOUNT THE SHIPPING FOR YOU. To return an item, you must contact us within 30 days of receiving the merchandise. Please inspect your merchandise the moment it arrives. We will issue you a RA (Return Authorization) number and provide instructions for the return. Once the RA number is issued, your package must be post-marked within 5 days of the return authorization date. If you exceed the above specified time frame (ie. Did not contact us 30 days after receiving the merchandise or packages was not post-marked within 5 days of RA authorization date) or we receive an unauthorized refused package or an undeliverable package, you will be subjected to a 20% restocking fee. The restocking fee is based on the merchandise total amount (shipping fee not included). Items that are returned without a RA number are not eligible for a refund. Please note that refunds are given for the cost of the merchandise (merchandise plus tax) only. Shipping charges are non-refundable for returns.