Features 1、VSWR: VSWR. forward and reflected power direct digital readout without any calibration.SL16 (Type N) is used to measure handheld radio. Note: Not compatible with digital radios. 2、Main Functions: Detect S.W.R, measure RF power (FF REV), measure frequency counter. Visible operation: frequency, power, SWR, FW, RW. 3、Low Loss, Easy to Install: Low insertion loss (0.3 dB or less) construction allows it to be permanently attached. Easy to install handheld radio walkie talkie SWR meter 4、Superior Performance: Built in frequency countries and regions. Interface is N SO239 (SL16); Maximum measurable power range up to 120 W. Durable metal housing is drop and wear resistance. 5、125‑525MHz Frequency Range: support 125‑525MHz VHF UHF handheld two way radio's power meter and SWR meter, digital standing wave meter. Specification Item Type: SWR Meter Material: Metal Meter Size (Without Socket): Approx. 75x70x35mm / 2.95x2.76x1.38in High Power: 120W VSWR: 1.00: 1~19.99 Frequency Range: Cover: 125MHz-525MHz Power Input: 5V (Micro USB) Frequency Counter: + -0.1KHz (+ -5%) Battery: 600mAh Lithium Battery (Included) Input, Output Impedance: 50Ω (Input and Output) Interface: N SO239 (Sl16) Package List 1 x SW 102 SWR Meter 1 x Charging Cable 1 x Instruction Manual