Powerstart jump starters are manufactured in the UK and designed specifically for the professional user, the Powerstart high rate jump start pack is suitable for starting most 12v and 24v engines, automotive, marine, and rail. With safety in mind, each Powerstart pack incorporates many safety features. Reverse polarity warning reduces the risk of wrongful connection, spike protection circuits reduce the risk of damage to the vehicle on-board electronic systems. The on/off isolator switch enables a safe connection due to non-live cable clamps and also avoids unintensional short circuit.