JTS US-802D Pro Instruction Manual page 27

7. Recommendation
(1) In order to achieve the optimum reception condition and also extend the operating distance,
please leave a "open space" between the receiver and transmitter.
(2) Keep the devices away from the metal objects or any interference sources, at least 50 cm.
(3) To avoid the feed-back effect, don't leave the mic. to aim at the speakers directly.
(4) For best pick-up pattern, please hold the middle of the mic. body.
(5) Remove batteries from the battery compartment when the transmitter will not be used for a
long time.
(6)When you need to replace the batteries, please replace both batteries at the same time with
new ones.
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WIRELESS MICROPHONE SYSTEM