As my old wireless lavalier system broke down, I order this K&F M8 system without know very well if his quality is good, as it is cheap. I have a very good surprise, the build is good, the packaging is beautiful but the most important to me is there, the noise level is really very low, almost no hiss and it works very well under a 50 meters distance. Also, during the tests I had no kind of interference in the signal, ever if I use my mobile phone close to it.The box come with the transmitter unit and the receiver unit, also with a lavalier microphone with enough cable length to be used by an actor. Also came with a cable link to connect the receiver to the camera, a hot shoe adapter for camera, a direct microphone without cable that can be attached directly to the transmitter and instructions manual.First I tested it with lavalier in a short interview, it works great. Also tested it with a professional NTG-2 R0DE shotgun microphone and also worked great. Another test I made is connect the R0DE microphone to a DSLR audio adapter, and then connect the output of audio adapter to the M8 transmitter “AUX” input. At also works great, one can use XLR professional microphones and then transmit the audio to the camera via the K&F M8 system, without any kind of noise or interference.Both receive and transmitter unit have a channel selector where you can choose between 6 different channels. Receiver also have a “MIC/AUX” selector, here you can select to use a direct microphone or a DSLR/Camera audio mixer/adapter. Receiver unit have a two buttons to change the audio lever to camera input.Both receiver and transmitter unit works with two AA cells, not included, due amazon delivery restrictions. I use AA rechargeable cells that lasts for two days of normal work.The LCD of both units displays the battery level, channel and volume level in receiver unit.Both receiver and transmitter unit came with a clip to use in the belt.I tested this K&F M8 with Leica SL camera, R0DE NTG-2, also with a R0DE lavalier and with a R0DE M2 professional Condenser Microphone. Also tested using a Marantz PMD-602A 2-channel DSLR Audio Interface.For a cheap system works really very well, comparable to other pro sets that costs more than 500 USD. Highly recommended.