Dual Channel Wireless Lavalier Microphone
First thing in the box is the instruction manual, 10 pages in Chinese and 10 pages in English. Everything well packed and nice enough to re-use when your transmitters are not in use.
I'll go through the manual because it covers everything the device does. The first section covers all the physical buttons on each device and what they do. A great reference to overview when you first get it. Buttons are solid, the device is metal. Everything feels very strong and well built. The battery door is the cheapest feeling thing on the device. You can power the devices with either two AA batteries or via USB. So if you have a portable power pack for your cell phone, you can use that to power these as well. I used my AmazonBasic rebranded eneloop batteries. (which I have found to last just as long as the regular branded eneloop batteries)
The next section explains all the features of the wireless transmitters and receivers. Low-Cut features, how you can record one mic to your left channel and the other mic to your right channel, or you can choose to mix the mics into both tracks. If you choose this method, you won't be able to separate the audio later, if you need to turn off the sound from one mic. Headphone output levels are separate from the main output line. I would assume you could hook up another recorder in this output if you needed. This page of the manual also shows the device specifications, frequencies, etc. This page also shows package contents. It came with a lot of nice adapters and cables. Thanks!
Next section showing removing the battery pack and shoe mount along with attaching the microphone and mic lock feature, which I love.
Next section explains how the frequencies work and the channels. With the WM-10, it comes with 2 transmitters and one dual channel receiver. Everything is already setup and ready to go out of the box. Just make sure the group is the same on all devices. The next page explaining how to headphone jack can have a separate audio output level as the line out output level. Then you have your troubleshooting.
In testing, I found the connection and quality to very very strong and clear. I had no issues with frequencies or bad signals. The led on the front of the unit will be solid red if the battery is low. If it is in, the red light will flash. You can put it in mute by tapping the power button once. (on/off is a long press)