After being in the computer business for over 45 years I know what is a waste of time and money.
I have reviewed three of the popular USB miners and here is the facts.
Moonlander 2

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Cost $59.99 on Amazon
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Power Consumption 10 watts
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Hashes between 3MH/S - 5MH/S
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Mines Lt Coin Only
So now you know the facts now let's doing a little math and see how much do you gain or lose?
Basing on the current price of LTC = $32.86 the cost of the unit would get you almost 2 LTC at today's price
Giving this unit a Hashing power of (5MH/S )( a pool fee of 1%), and electric cost at (.10 per KWh) here are the totals
Profit per day Mined/day Power cost/Day
$-0.01 .0003645 $0.02400
Profit per week Mined/week Power cost/Week
$-0.08 .002552 $0.1680
Profit per month Mined/month Power cost/Month
$-0.40 .01094 $0.7200
Profit per Year Mined/Year Power cost/Year
$-4.43 0.13330 $8.76
so with all of the up front investment and cost of electricty for one year you could have at least 2 LTC
with this unit it will take you 15 years to get 2 LTC.
GekkoScience USB Bitcoin Stick Miner

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Cost low $39.95 High $50.00 on Amazon
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Power consumption 60 Watts
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Hashes 8 GH/S
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Mines BitCoin Only
So now you know the facts, now lets do a little math and see how much we gain or lose?
Based on the current price of BTC =$3556.89 the cost of the unit would get you 0.0112521 BTC Based on a $40 purchase
Giving this Unit a Hash power of (8GH/S) (a Pool fee of 1%) and a electric cost of (.10 per KWH) here are the totals
Profit per day Mined/Day Power Cost/Day
$-0.1 N/A $0.1440
Profit per week Mined/Week Power Cost/Week
$-1 0.00000239 $1.01
Profit per month Mined/Month Power Cost/Month
$-4.28 0.00001026 $4.32
Profit per Year Mined/Year Power Cost/Year
$-52.12 0.0001248 $52.56
So with all of the up front investment and and the cost of electricty for 1 year you would have 0.02589 BTC
With this unit it will take you 207 years to get 0.02589 BTC
Sapphire Miner

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Cost of $69.90 on Amazon
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Power consumption of 10 Watts
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330 GH/S
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mines BitCoin Only
So now you know the facts, now lets do a little math to see how much we gain or lose.
Based on the current price of BTC=$3556.89 the cost of the unit would get you 0.01966 BTC Based on a $69.90 purchase.
Giving this unit a hash power of (330MH/S) ( Pool fee of 1%) and a electric cost of (.10 per KWh) here are the totals
Profit per Day Mined/Day Power Cost/Day
$-0.02 N/A $0.02400
Profit per Week Mined/Week Power Cost/Week
$-0.2 N/A $0.1680
Profit per Month Mined/Month Power Cost/Month
$0.70 N/A $0.7200
Profit per Year Mined/Year Power Cost/Year
$-8.74 0.00000529 $8.76
Note: N/A the amout of BTC is so small the caculator Errored out.
So with all of the up front investments and the cost of electrity for one year you would have 0.02212 BTC
With this unit it will take you 4,181 years to get 0.02212 BTC
For me I don't know how these companies are still in business, and that most people who buy into this really dont' know the market.
You can get more Bitcoin on this gamling site every hour you can spin and get between .00000056 and .05608432 BTC and it is Free. So why would anyone but one of these USB Miners?????

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