Features:It is made of high quality metal material, strong and durable.It can adjust the received signal by switching the antenna, convenient and practical.The interface with the antenna is made by precise technology, and there is no problem of bad contact.It can be connected to three antennas, outstanding performance.The impedance is only 50 ohms and the loss is very low.Specifications:Material: MetalSize: Approx. 9.5*7.7*2.9cm/3.74*3.03*1.14inchFrequency: DC-800MHz2 Position Switch 1-Input -3-OutputsInsertion loss: less than 0.1dB (DC-500MHz), more than 0.15dB (500-1000MHz)Isolation: more than 60dB (DC-500MHz), over 50dB (500-800MHz)VSWR: less than 1.1 (DC-500MHz), less than 1.2 (500-1000MHz)Through power: (less than SWR1.2), 1.5KW (DC-30MHz), 1KW (30-150MHz), 500W (150-800MHz)Impedance: 50 OhmInterface: M-J InterfacePackage list:1 x Switcher2 x Screw.Note:Please note that CX-310 and CO-301 are the same product, and make sure you will not mind before ordering.