Dual UHF Wireless Microphone with Bluetooth Receiver, No Need To Set, Just Plug and Use. Perfect for Karaoke, Speech, Meeting, Performance, Indoor or Outdoor. K380A not support For multiple sets using, but our K380S or K18 Rechargeable Wireless Microphone can support 10 sets at max for Simultaneously Using | 1/4 Inch(6.35mm) Receiver Input designed for Outdoor Karaoke Speaker, PA Speaker System, Power Amplifier, etc. K380A not for Bluetooth Speaker, Phone, PC. The Receiver can not search and connect with other Bluetooth Devices. We only can use phone to search and connect the Receiver to play background music, Receiver can transfer both voice and music signal to speaker | Microphone and Receiver use UHF Connection Technology, Indoor range >50ft(Outdoor range >100ft); Receiver with Bluetooth to play background music(BT Range 16ft - 33ft Outdoor); Frequency Response 50Hz - 18kHz, SNR >70dB; 10 UHF variable channels(CH01-CH10); 2 x High Quality Microphone Windscreen as a Bonus | Microphone use 2 x AA batteries(Not Included); Bluetooth Receiver(Built-in rechargeable Lithium battery) | Best Customer Service, 30 days cost back and 12-Month Replacement. Our company is an old and innovative company, product quality is our life. It's our duty to keep microphones with high quality. So if you have any problem about our microphone, please must contact with us. Click Sold by "Kithouse Direct", then leave a message to us. Your problems and suggestions is the key for us to improve. Thank you for choosing Kithouse products