Kelta is a Slovak company offering cloud mining services. The user sends ETH to the Kelta wallet, then buys KLT tokens which are based on the Ethereum blockchain, and can start mining currencies - ETH, XMR, ZEC or BCH.
The user defines how much of which currency they want to mine. One Kelta token represents 1W of mining power.
With Kelta you can easily calculate your approximate yearly profit. KELTA, which works within Blockchain, offers it's members a variety of multilayered loyalty programs. See, which of the programs is the right one for you and eliminate maintenance costs, mine more than one cryptocurrency, or have 24/7 support available.
This company is highly suspicious. Minimum investment of 5.25 ETH to start mining, promise of 135% ROI, the moee you invest the more ROI you have, their token has no blockchain (at least I don't know about any), affiliate program offering 15!!!% of affiliate's first investment (5.25 eth gives you 0.785 ETH - where from??), there is no proof of existence of the machines they mine on, also when I sent ETH to my kelta wallet, there was not even a transaction on ether scan. Project is ran by Juraj Mác aka. George Mac, who was accused of fraud in Slovakia. Project has scammed people few years ago through ICO. Not a legit company. It's a scam even if they are paying now. Consider your investments in this company.