20/1 Packed in paper box, built-in one charge, one antenna, one clip and one rope.Support OEM customization. The frequencies are UHF 400-- 470MHz and VHF 136-- 174MHz.The product quality is safe and reliable, the distance is far.Strong penetration.The sound quality is clear.It can be applied to construction sites, high-rise buildings, port docks, large supermarkets, communication distance of 3--8 kilometers, indoor use area of 20,000 square meters.