We tested all products before shipment as we stated above, if you have any problem with the aircraft or other product(s) you ordered from us, please report it at the time when you received the shipment (not after use please). We have no control over your flying skill, behavior or the conditions you have chosen to fly in.
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Please understand that RC helicopters and airplanes can crash if mistake made or you do not know how to fly, any kind of crash or hard landing may caused damage(s) to the helicopter or plane. *** Return / exchange / refund is not allowed if the item has been used or flew. Please also check over the product (especially the helicopters and air planes) and make sure they are all good every time before use (or taking to the air). *** Please inspect the product when you received the shipment, identified any issue and report to us BEFORE you try to fly / use it. *** All items are tested by manufactures to make sure they are working properly before we ship them to our customers. We reserves the right to return merchandise to its customer and not refund money, if we in our opinion deem that the merchandise has been used, crashed, abused, misused or modified in any form, or has been damaged by water, dust, or other contaminants.
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For returned merchandise that is found to be genuinely defective, we ship out replacement for free (we pay for the replacement shipping cost) and will not charge additional shipping and handling fees. Customer will be responsible for the return shipping cost to send return back to us. Shipping and handling charges for all orders are non-refundable, as we have paid the Post Office to send the shipment and the Post Office will NOT refund the postage cost back to us after they processed the shipment. so you can check with your local shipping carrier.) We will not responsible for the lost of returned merchandise in shipping. All merchandise should be returned to us by shipping carriers with safe method which provides proof of shipment (just in case your item does not reach us. Returned merchandise must be received from our customer before we will process and ship out any replacement. Items returned must be in as-new conditions with the packing slips, manuals, accessories and all other items intact in original packaging. We reserves the rights to entertain requests received thereafter. Request(s) for return or exchange and report(s) of missing or damaged part(s) must be received within 30 days of your receipt of merchandise(s). If the item we sent you is defective when you received the shipment from us (NOT AFTER USE), you can report to us by email for return / exchange / refund arrangement. because of the assumption that it is computationally infeasible to find a message which corresponds to a given message digest (brute force attacks that try to exploit this feature are called preimage attacks), or to find two different messages which produce the same message digest (when this occurs, it is referred to as a collision, and finding two different messages that produce the same message digest is the goal of a birthday attack).Our warranty/ return / exchange policy is very simple. The SHA algorithms are called secure because of their on-way property, i.e. The SHA algorithms are distinguished as SHA-0, SHA-1, and SHA-2, with SHA-1 being the most widely used of the existing SHA hash functions (SHA-1 produces a 160-bit message digest). by comparing message digests calculated before and after transmission it is possible to determine whether any changes have been made to a message or a file integrity in transit. This feature allows for application of hashing functions in verifying integrity of files and messages, e.g. In case there's any change to data after the original hash was taken, the resulting hash taken after modification will be different from the original hash.
Hash functions are based on the one-way property which means that it is easy to apply hash function to data and produce a digest, but it's impossible (or very difficult) to recreate the original data from the result of the hash function alone.
The hash value is sometimes called the message digest or simply digest.
Hash function operates on variable-length input (e.g., a message or a file) and outputs a fixed-length output, which typically is much shorter than most input values.
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A series of cryptographic hash functions that produce an output of selectable length of either 160, 224, 256, 384, or 512 bits for input data.
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