NET
10 They have tails and stingers like scorpions, and their ability to injure people for five months is in their tails.
Darby
10 and they have tails like scorpions, and stings; and their power [was] in their tails to hurt men five months.
KJV
10 And they had tails like unto scorpions, and there were stings in their tails: and their power [was] to hurt men five months.