One of SM-2200 and SM-2500's patented technology contents

When the antenna approaches the satellite which needs to receive, our satellite meter special sound can lock the satellite signal, and makes “po,po,po” sound; If it is nearer, the sound is more crowded.

This patent guaranteed that will not report mistakenly the signal, will only lock the only satellite.

Moreover SM2200 and the SM2500 are only weight 0.5 kilogram, is much lighter than the similar products weight

The  free satellite receiver re-equips the star identifier, cannot achieve this function,they only can look that the signal instruction to adjusts the antenna, under the open country and the intense sunlight, they also cannot look at  the tv screen clearly.