I've only just received the delivery and did a very quick and unscientific test just to make sure the units were working. Both TX and RX were powered using a couple of phone backup power banks which worked perfectly with them. Not sure if I can update or edit this once posted, but I'll try and do that when I've had a chance to use them in anger. I bought this particular kit because of using the Storm 1000 and 3000 and being mighty impressed by the performance of those (yes much more substantial kits) under pressure in a packed stadium. Just sometimes a job calls for a smaller tidy unit.