Don't Buy Kamoer or CORALVUE products. I will not. Kamoer and CORALVUE joint hands and CORALVUE was the one who distributed huge numbers of these faulty Kamoer F4 PRO. Also CORLAVUE was the one assigned for repairs and support for Kamoer but they won't give much support. After they released, sold and distributed, Kamoer made the product obsolete. Kamoer F4 PRO is not in prodcution and phased out after selling them very expensive to customers. I bought four brand new for relsale as i'm a retail store and CORALVUE was abusive service provider to begin with, i.e., they never provided any help but talk some horrible things about Kamoer and wanted to out of their responsibility in repairing these products. They love to charge a lot of money and will ask for this scan code and that code and they will wear you down. Kamoer as well as CORALVUE commited fraud by doing this to USA hobbyist. I will never buy any of their products as both lost credibility. They both act like scammers. So any hobbyist thinking of spending money on Kamoer as well as coralvue products should be careful and avoid their products. Some may like their products and some might have gotten support from CORALVUE. But majority of us got burnt.