The Day used a four-cylinder, 30 hp (22 kW) engine and shaft drive.
Removal of the rear seat and doors allowed the car to be converted from a five-seater touring car to a light truck in one minute.
[citation needed] As a truck, the Day was able to carry up to 1,000 lb (450 kg) in a 36-inch (910 mm) by 96-inch (2,400 mm) cargo space.
The rear seat could be lifted away by triggering two spring locks.
This article about a brass-era automobile produced between 1905 and 1915 is a stub.