This is a great product! The units are very user friendly. The receiver goes onto the dslr camera (with the 3.5mm cable plugging into the mic port on the camera). The transmitter goes onto the person speaking, and the lavalier mic plugs into that. This is great because it allows you to record your video and audio at the same time without having to sync the audio in post. The wireless ability makes filming much easier as well. The battery life on the units are excellent. I recently filmed a 4 hour conference (having the transmitter plugged into a sound mixer) and the battery levels were still at full bars! The volume on these units are very sensitive. I kept mine on volume 1, and you can further adjust the volume on your camera. Another cool thing was that I was filming with 2 cameras (1 receiver each camera) and they both recorded the audio being sent from the one transmitter all at the same time with no issues.The design of the product is simple and modern. There is a power button (which is pretty responsive, powers up in about 1-2 sec), and the channel and volume buttons are inside the battery compartment. Thank goodness these units use AA batteries! The LCD screen is bright and shows you what channel you're on as well as the battery life in bars. The units come in a really nice box with a foam insert cut to fit the units.I'm currently using this for my youtube channel (vegan rev)! You can check out the sound quality in the attached video!