What's Included A FIFINE MICROPHONE K025 A 1/4" output connector receiver (Using with mobile, please order a smartphone adapter cable ) Features Get live events well-prepared in a short time The handheld microphone (transmitter) is pre-paired with the receiver. Setup is a breeze with this wireless system! Just remove from the box, insert batteries, plug into PA speaker, guitar amplifier, mixer (any device that allows 1/4" mic input) and start to rock! To get the most out of it, follow these three tricks when using it with a PA system. The battery-powered system provides the greatest convenience for outdoor use. Even the most generic AA battery(*2) for the back-pack transmitter and AAA ones(*2) for the receiver can last for 4 hours. Successful presentation/speech, audio counts Cardioid microphone along with a fine-tuned integrated circuit limits self-noise and handling noise and blocks out background sound in any noisy environment. K025 is a dynamic microphone that will reproduce the warmest sound when you speak from around 3" away. cleanest and Though being less sensitive, it is branded as FIFINE, with the heritage of clarity. Thanks to its wide frequency response, the bass is not overwhelming and a crisp tone is still heard. Consistently stable performance for both indoor karaoke nights and outdoor gigs UHF (Ultra High Frequency) is a more penetrable and powerful signal, therefore a better choice for using in built-up areas. Object interference is no problem in a hall or church with a wireless range of 80 feet . Outdoor performance could be even better and more stable! The unique identification of each system helps in use with multiple sets (4 at most) concurrently with ease (set one system up at a time). 20 frequency channels make clear signal transmission in a less than perfect environment possible. Wireless conflict will not spoil your show! When experiencing interference, like hissing or dropout, unscrew the battery cover and click the button on the inside to find the best-suited frequency. Notice: There will not be a change in channel number (always CH01), but the receiver indicator will turn from red to green and back to solid red. Specifications Frequency Band UHF 565-584MHz Type Dynamic Polar Pattern Cardioid Frequency Response 50-18kHz Sensitivity -50.60±1dB (at 1kHz) S/N Ratio More than 58dB Power Supply Microphone: 2 AA Batteries Receiver: 2 AAA Batteries Output Connection 1/4" TS connector Shipping Weight 0.6 kg Contact *For self troubleshoot and tutorial video, check out more a t the K025 product support page . *For more info about technical aspects or email support, feel free to click this link Contact Us .