The 3N0401BK-028 is an Antennas ROHS manufactured by HJ Technology. It is a type of antenna that amplifies signals from medium distances and is designed for use with a variety of communication tools, including mobile phones, tablets, laptops, and other Wi-Fi enabled devices. This antenna is RoHS compliant and operates within a range of 2.4GHz to 5GHz, transmitting/receiving signals with less than 3db noise figure. It has a gain of 0dBi, a radiation efficiency of 70%, an angle of response of 90°, an Impedance of 50 Ohm, and a VSWR of <2. The antenna is extremely durable and has a high resistance to wear and tear. It is also relatively light, and has a wide frequency scope for optimal use.