We provide our customers the whole-life technical supports for the equipments we supply. After warranty a service charge will be taken. In case an unit must be returned for repairing, before shipment,  please make sure: A document with model number; serial number and describing what the problem is should be provided. We would like that the unit is packed in its original container. If the original container is no longer available, please packing the unit safety enough to a long distance travel. Cost of Shipment: If the device have defect in the first month since the date you've received it , it will be replaced complimentary and no charge of shipment in round way. We only pay a one-way cost of shipment ( and Custom charge in China side) if the damage happens from the second month of receiving date.     NOTE: we do not assume responsibility for damage caused by improper packing of returned unit(s). The following situations are not covered by guarantee Your guarantee is expired. The unit fails to perform because of operators’ faults. Warranty mark is modified, damaged and/or removed. Damage caused by Force Majeure. The unit has been unauthorized alteration and/or repaired. Other troubles caused by operators’ faults. Damage caused by irregular power supply voltage