This a CLASS III Approved medical scales. It is used where an approved weight is required for a person, such as boxing clubs, Medical Centres, Horse Racing, GP's Office & Hospitals. We have also sold many of these to weight loss groups & gyms. The scales because it is CLASS III approved can only weighing in Kg’s. You have the option of a pole display or remote desktop display both of which are the same price. The scales is powered by an internal rechargeable battery or mains adaptor. There is a easy to use BMI function. This is has NOT be designed for home use and cheaper alternative are available from other suppliers.