A base station has a first antenna for emitting radio waves at a first tilt angle and a second antenna for emitting radio waves at a second tilt angle different from the first tilt angle. The container described comprises a first compartment and second compartment for storing a first and a second composition. The host computer is used to test the target computer to turn power onoff and output a power-on signal and a power-off signal to the target computer based on a feedback signal. The rear surface of the second compartment includes a projection and the rear surface of the first compartment and the top surface of the first compartment form a corner having an indentation for receiving the projection.