Runs pretty fast on my 31-40psi GMC Yukon tires. Just enter the maximum pressure and the device will turn off when it reaches that value. No need to "baby" him while he's adding air. The hose end is screwed onto the tire valve. Light enough to be carried around to add air to trailers, tractors or whatever. Also works with a smaller M12 battery (just not as long obviously). I doubt you will be disappointed with your purchase. Actually I only received the device (Milwaukee sells them two ways) No battery or charger. Good communication with the seller and we worked out a fair price (they refunded part of the money).