Methods, systems, computer-readable media, and apparatuses for a smart device are presented. In some implementations, a system comprises a main device including a processor, and a band including one or more sensors, memory, and a battery. The band may be configured to communicatively and mechanically connect to the main device, and to store data received from the one or more sensors into the memory. Upon being connected to the band, the processor may be configured to obtain the stored data from the memory of the band, and process the stored data obtained from the memory of the band.
