Features: 1.Dual UHF Wireless Microphone with Bluetooth Receiver, No Need To Set, Just Plug and Use. Perfect for Karaoke, Speech, Meeting, Performance, Indoor or Outdoor.  2.1/4 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.  3.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 - 15kHz, SNR >60dB; 10 UHF variable channels(CH01-CH10);  4.Microphone use 2 x AA batteries(Not Included); Bluetooth Receiver(Built-in rechargeable Lithium battery).     Specifications: Frequency deviation:±11kHz;  Frequency response:80Hz-15kHz;  Frequency stability:±0.005%;  Signal to noise ratio:>60dB;  Distortion:0.5% (1kHz);  Number of channels:two channels;  Sensitivity:-70dB M;  Use distance:50 meters in open area;  Receiver power supply:DC 12V/320mA;  Transmitter power supply:AA battery (not Included);  Transmitting power:20mW;  Frequency range:200MHz-270MHz;  Output mode: independent and mixed automatic selection;     Launcher: Frequency stability: ±0.005%;  Carrier output power: ≤30mW;  Stray radiation suppression: >40dB;  Modulation method: vhf;  Maximum modulation degree: ±75KHz;  Pickup method: (capacitive) (LWM-6188/C);     Receiver: Receiving sensitivity:40dB;  Audio output impedance:600Ω;  Audio output level:0-0.5V;  Power supply:AC220-240V 50/60Hz;  Power consumption:1W;     Package included: 2 x Microphones;  1 x Receiver