Beltpack Microphone Kit: This wireless microphone kit includes 1 beltpack receiver, 1 transmitter, 1 headset microphone, and 1 lavalier microphone. Frequency selectable: 25 selectable UHF frequencies per channel, resistant to electrical interference with stable signal transmission. In case of interference, press the frequency change button on the receiver to switch to a clear channel. Easy to install: Plug and play design with rechargeable batteries. Choose either the lavalier or headset microphone, connect it to the transmitters microphone jack, power on both devices, and begin use immediately. Compatible devices: The receiver features a 6.35 mm output jack, compatible with most mixing consoles, audio interfaces, effects units, and powered speakers. A 6.35 mm to 3.5 mm adapter is included for connection to devices with 3.5 mm inputs. Note: Not recommended for use with microphone inputs on phones or portable recording devices. Automatic connection: The transmitter and receiver pair automatically within up to 50 meters, requiring no manual setup for quick and reliable operation. Durable metal construction: Both transmitter and receiver are built with metal housings for enhanced durability and heat dissipation. Compact size allows for easy portabilityfits in a pocket for convenient transport. Multi-purpose applications: Ideal for live sound, public speaking, sermons, weddings, speeches, school performances, training sessions, interviews, and audio or video recording. Important information: 1. This system does not have built-in speakers. An external audio system is required for sound output. 2. Before connecting the receiver, reduce the volume on the external device to prevent audio spikes, then gradually adjust to desired level. 3. Not compatible with MacBook devices or Bluetooth speakers. Product specifications: - Preset frequencies: 25 - Frequency range: 500 MHz 980 MHz - Audio frequency response: 75 Hz 18 kHz 3 dB - Preset frequency pairing: 25 channels with automatic synchronization - Signal-to-noise ratio: 96 dB - Battery type: Built-in lithium-ion battery - Maximum frequency deviation: 50 kHz (with level limiting) - Total harmonic distortion: