[3 x 2] 6W of power at 5V inputThe power supply is recommended to take the USB-5V or a single lithium-powered.Power: 3.6 to 5.5V, single-cell lithium battery or USB power supply suitable and can also be used four 1.2V battery-powered, when use transformer power supply, be sure to add a 5V regulator circuit, more than 5.5V chip will burn.