You will feel more like it for setting up a wireless system after paying a bit more attention to six things.
1. Power issue
Low voltage brings up problems, like cutouts, dropouts, or distortion. Lithium-ion batteries outlast Ni-Mh and Ni-Cad ones. Because of up to 20% less voltage output, a rechargeable battery is far from an ideal option as it seems to be. So if the budget allows, a one-time use lithium-ion battery is the best choice for the battery power transmitter and receiver.
If the receiver is wall-outlet powered, try with the same type or equivalent electrical specifications, like plugging the power adapter into another wall outlet. Even the problem could lie in the adapter itself. By the time a new outlet does no good, you may need to test with another power adapter. And do not forget to press the power button and turn up the volume.
2. Antenna placement issue
Metal object human body have an impact (block, absorb, or interfere) on wireless signals. So it is better to always keep the antennas of the transmitter and receiver in line-of-sight.
3. Audio cable issue
Static or even a cutout could result from a poor connection. If re-connection does not help, try disconnecting the audio cable and using another included cable to see if the new one is OK.
If using a FIFINE K037B or K038 body-pack transmitter, replace the attached lapel mic or head-worn mic with the same model and test if there’s any issue.
4. Mismatch frequency channel
If the FIFINE microphone (transmitter) and receiver keep failing to sync. First of all, go check the number labels on your transmitter and receiver if they match exactly.
5. Frequency channel is not ideal for the location
If experiencing cutout/auto-disconnection or setting up the system in a new location, use the feature of the selectable frequency channel of the FIFINE wireless system to find a channel that suffers less interference from local TV or broadcast channels.
6. Interference from other electronics or wireless systems
Turn off electronic devices that are within 5 feet of the wireless receiver, such as a computer and especially a router. Or take the system to a different location that is at least ½ mile away. If it works OK there, the problem lies in the interference from other devices. Finding the exact source may take you a bit of time by turning them off one by one and doing the test at a time.