This model measures NXDN (FDMA) and DMR (TDMA) digital radios. The Nissei DG-503MAX is a digital power and S.W.R. meter for analog and digital two way radios with a maximum measurable power range of up to 200W. It has UHF Female (SO-239) in and out connectors. highly accurate for measuring Forward Power, Reflected Power, and the VSWR of Analog and Digital transceivers Large LCD (3.5″) backlit display for easy of reading Measurement (Analog mode): CW, FM, FDMA Measurement (MAX mode): DMR (TDMA), AM, SSB Calibration point: 28 / 145 / 435 MHz Maximum measurable power range up to 200W Minimum Power for SWR 1W Checks your antenna SWR Checks your radio RF power wattage Easy to install DC Power source :internal “AAA” batteries / external USB port Applicable rechargeable battery. Micro USB – DC 5V output (does not include adapter). Convenient control layout for easy operation. Frequency range: 1.6-60 MHz / 125-525 MHz Insertion Loss: Less than 0.1 dB Testing functions: Fwd/Rev Power, SWR ratio Accuracy: (AVG) + / - 5% Impedance: 50 Ohm Interface (in and out): UHF female (SO-239) Includes operation manual and DC 12V wire Model number: DG-503MAX Dimensions: 5.51 in.(W) x 3.30 in. (H) x 4.80 in. (D) / 140 x 84 x 122 mm Net Weight: 1.65 lbs. / 750g