2 Persons can use this detachable foot massager at a time. The upper multi massager is wireless, it has an inbuilt battery, it automatically gets charged when it is attached with a lower foot massager with the power cord plugged in. The upper multi-massager can be used to massage arms to legs. Both upper & lower massagers have inbuilt control panels, which are used to access or customize multiple modes intensities. It is equipped with an automatic massage mode, which can be accessed easily with few clicks. It is equipped with a relaxing thermal function. It is equipped with upgraded battery use technology, 3 hrs of charging last for 1.5 hrs of usage.