The proliferation of nifty home and security gadgets has begun to infringe on bandwidth, and in some cases, their signals conflict with more powerful transmission networks, rendering the consumer devices redundant. Now the Spectrum Management Authority , which says persons have been turning up at its doorsteps more frequently to vent their frustrations, is trying to alert consumers to the real impact on the spectrum of the wireless devices they buy online or while overseas, and is now trying to police the activity to safeguard the integrity of the bandwidth it manages and sells.