Can you adjust the sound level? Does it have a battery indicator? How long does it last on a full charge? It has adjustable sound level buttons on the transmitter that connects to the microphone and has great displays on both the receiver and transmitter that show frequency, battery level and volume control.It will last over 5-8 hours on a full charge. How to pair the receiver and transmitter? Automatic pairing after power on. The signal prompt light in the upper right corner of the display screen will flash to indicate that the device is being paired, and stopping the flashing will indicate that it has been paired successfully. Can I use multiple devices to work simultaneously? You can use multiple devices to work simultaneously, Each device will transmit on a separate sub-channel and will not interfere with each other. If the receiver interface is insufficient, you can choose a dual transmitter version. Why the product is not charging properly? Through our testing of the product, the reason why the product cannot be charged is that it is not compatible with some charging cables. For its better charging, please use the attached charging cable to charge the device Can the transmitter and receiver switch channels? Does it support condenser microphones or phantom power? Unable to switch channels. It enables multi-device connections via sub-channels, Supports 5V condenser microphone, does not support 48V phantom power.