I have a charger wanted that I can use for cars and trucks and has been attentive at Amazon on this charger. It was state with an input of 12 V 24 V, the charger is supplied then supplied with an input of 12V 18V. I have pointed out cable Direct contacted and asked if I can use the device for 24 V phone. It could give me at the moment no one answer, but they wanted to contact me again, there was no answer. So I have the part ultimately sent back. I can not say anything because I could not use it, one star I forgive because cable Direct has changed the description, now 12V-18V via the function of the device.