Hi friend, This is kevinleo scent Team, we are glad to know you have bought our scent machine, Currently some customers leave us message on amazon. no reply forever once we replied at once. however customers leave review directly and said: we did not reply them. this is no unfair. If buyer just send message on amz,however no check message on amz. no body can settle problem. Kevinleo scent is professional scent provider with 7 years. we totally hope you have good experience in our store.