By the working distance of the remote control, forcing no less than 100 meters and continuous period of not less than 150 minutes, in case there is Sun and 70 minutes, in case there is no sun.
The range of the remote control is not less than 100 meters and operate continuously for at least 150 minutes in the sun and 70 minutes in the absence of sunlight.
The phase function of the remote control force is less than 100 meters. And work continuously for not less than 150 minutes in case of solar and 70 minutes in the absence of solar.