1 This headset does not have a sound amplifier, you need to plug the receiver into the speaker to use it. 2 For the first use, some headsets may require ID pairing / reset. 3 Can't keep it? No, this microphone is energy efficient. If it is not used for 5 minutes (no voice input), the headset microphone will turn off automatically! 4 To avoid static electricity, turn off the speaker volume before using it, and then turn it on gradually. 5 No voice problems: The working lights of the microphone and receiver are both on (meaning there is no problem with the product), and you also use a 6.35mm to 3.5mm converter, which is a problem that the converter is not connected properly. So please don't use a converter and try plugging the receiver directly into a large speaker (6.35mm port), it works fine. How to identify pairing / reset: Headphone PWR button: Power on (short press) to turn off (long press 3) ID paired headphones: PWR button (long press 10) Receiver PWR button: Power on / off (long press for 3 seconds) 1 Turn off the receiver (first), then turn on the headset; 2 Press and hold the PWR button of the headset for more than 10 seconds until the pink light turns on and blinks. Then power on the receiver; 3 times at the receiver (the light next to "DC5V" flashes three times, press the headset "CH" button to confirm the ID matches; 4 When both the headset and receiver's PWR buttons (next) are blue, ID pairing / reset will succeed. Now you can plug the receiver into the speaker and use it! First, the microphone uses UHF band to avoid interference signals anytime, anywhere, and the working distance is 15 meters (measured non-turning wireless distance of 25 meters, continuous sound does not interfere); 2. The original receiver box uses a 3.5mm audio head, which can be directly plugged into any audio use, without the need to connect an output cable, distribution 6.5mm adapter (can be directly plugged into the bus car audio and outdoor rod speakers, etc.); Third, the use of power supply: Built-in polymer lithium battery for headset and receiving box (with full battery certificate), battery life is 5 hours; USB charging port with DC-5V, built-in mobile power can be charged at any time; 4. Craftsmanship: The headset and receiver box adopt a miniature design, which is compact and portable; Five, a full set of accessories: 1 headset, 1 receiving box, 1 USB head charging cable (one for two), a 3.5 male and female head adapter cable, a 6.5 adapter, manuals and packaging in 6 countries; Scope of application: business travel bus, business promotion, personal, family entertainment, conference hosting and teaching training, outdoor mobile KTV, etc. Seven, international certification: American FCC, European CE, ROHS, BQB, Japanese TELEC;