With 2.4GHz wireless technology, the Nano receiver can connect keyboard & mouse at the same time. The mouse can switch into 3 resolution dpi, including 800, 1200 and 1600dpi. Keyboard is Traditional Chinese version. Turn in sleep mode after inactive status for 56 seconds in order to save more power. The Nano receiver can be left in the USB port or stored in the battery compartment. 2A & 3A batteries are included, which can be used immediately.