Fulfillment by Amazon (FBA) is a service we offer sellers that lets them store their products in Amazon's fulfillment centers, and we directly pack, ship, and provide customer service for these products. Something we hope you'll especially enjoy: FBA items qualify for FREE Shipping and Amazon Prime.If you're a seller, Fulfillment by Amazon can help you grow your business. Learn more about the program. TONOR TW820 handheld wireless system combines professional-quality sound with simple setup and an intuitive interface for excellent audio performance right out of the box. The cardioid polar pattern is effective against off-axis noise causing feedback and unwanted ambient noise. The dual antenna design represents diversity technology which provides optimum resistance against RF interference and drop-out. The working distance of TW820 is about 200Ft/60m in the wide-open area.It gives you stable signal transferring and great freedom of movement. A multifunction LCD display provides room for flawless operation by displaying the group, channel number, RF and AF levels clearly. Ideal for the family home KTV, church, parties, Karaoke singing, conferences and etc. Note: Please make sure there is a 6.35mm mic input on your device before connecting the TONOR wireless microphone to it.