Police in the South Hams have seized an electric stun gun which was bought online from abroad and posted to a hotel.
Anyone caught with one could be jailed for 10 years and officers say investigations continue.
A spokesperson for Kingsbridge Police said: "This very dangerous item was taken off the streets today thanks to staff at a local hotel.
"These electric stun devices deliver a nasty shock and could cause serious health issues.
"They are completely different to our Taser devices which hold 50,000v, and 1200v when arcing.
"Possession of a device like this is illegal and carries a maximum 10 year prison sentence."