30 day return and repair for defects only. This does not include mishandling the device, or trying to apply more voltage than the 9VDC or 12VDC limit set to the device. All devices are thoroughly tested before sending, and are in perfect working condition upon shipment. But things happen. So if a device by some freak chance, does not work, just email me at email@example.com within 30 days of purchase and send the device back to me and I will repair it and return it to you and repay the shipping that it cost to send the device back to me. ALL SALES ARE FINAL.