In fact, this products is just sold in China. All products had buy from China agent and if any problem, we can send it to agent and replace new one.
Of course, if your wave maker had problem, that will consume the shippment fee to return so before I arrange the shippment, I must check the equipment and confirm all in condition, then send.
So every fishfriends must consider this point.
About some friends worry non- delivery after payment?
Yes, nowaday, too many swindlers are thought internet to make crime.
I had make the coral trading in HK about 3 yrs and sometimes send the goods to foreign countries. You can make the good choice for yours.
Of course, If compare the efficient of Yat Sun & Tunze , I choose Tunze, but so expensive! Yat Sun wave maker also cheaper but canbe acceptable so too many HK fishfriends had buy and satisfactory.