Through a browser-based script the free Bitcoin miner uses  your CPU for solving hashes to mine Monero (XMR). We then exchange the Monero mined by you to Bitcoin and send the BTC to your wallet.
Our free Bitcoin miner uses your CPU to mine XMR instead of Bitcoin because to mine Monero you have to calculate hashes with an algorithm called Cryptonight. This algorithm is very compute heavy and was designed to run well on consumer CPUs making CPU mining of Bitcoin more efficient than mining BTC directly.

Your earnings with the free bitcoin miner depend mainly on the CPU power of your device. The more powerful it is and the more Bitcoin you will earn. If you have more devices, you can use them all to mine BTC using our free bitcoin mining system. Simply login from each of your devices using the same BTC address and start the Bitcoin miner to increase your earnings.
The amount of Bitcoin that you can earn will also vary from time to time depending on the Monero mining difficulty and on the Monero to Bitcoin exchange rate. If Monero mining difficulty rises the number of hashes to solve to get 1 BTC will increase while if the Monero to Bitcoin exchange rate rises the number of hashes to solve to get 1 BTC will decrease.

If you only have access to one computer or device it is not useful to use more than one free bitcoin miner at the same time.
If you have access to more than one computer or device you can open the free BTC miner page on each of the computers and devices, login with the same BTC address and start the miner on all your computers and devices. In this way you will solve more hashes at the same time and earn more Bitcoin.
Please, take into account that when the miners are working, in the “Stats” section of each browser window you will see the hash power and mined hashes of that single computer or device while the balance shown, that updates about every 5 minutes, is calculated for all the computers and devices together. So when the “Withdraw” button is enabled you can withdraw only from one computer or device. If you try to withdraw from all the devices only the first withdrawal started will be completed and the other will return an error. Please, don’t try to cheat our system as you may be banned also by faucethub.io, our payment provider.