The Cigar Oasis Ultra electronic cigar humidifier was designed to mount on the lid of the humidor with minimum space requirements. It has two modes of control. When used with battery power, it works until the desired humidity is reached. The unit essentially goes to sleep once the humidity level is reached and will sample the humidity every 5 min. When operating on line power, it samples the humidity continuously. In both cases, the control point is set to 70% humidity. The unit comes with a sealed water cartridge mounted and ready to use.