Check the listing for details. RS-70 Digital SWR Watt Meter Digital LED Backlight Shortwave Standing Wave Ratio. Condition: New. Listed at 145.17 USD. RS-70 Digital SWR Watt Meter Digital LED Backlight Shortwave Standing Wave Ratio Table HF 1.6-6.0 MHz 200W for Walkie Talkie RS-70 Digital SWR / Watt Meter, Designed specifically for amateur radio enthusiasts, the R7-50 is easy to use and accurate, showing both forward waves / reflected waves / standing waves. Main Features: 1. Forward / Reversed / VSWR ration in one push button. 2. LED backlit display for easy of reading. 3. Power Source: internal "AAA" batteries / external USB port. 4. Applicable rechargeable battery. 5. Micro USB-DC5V Ouput (do not include adapter). 6. Convenient control layout for ease of operation. Specifications: Frequency range: 1.6-60 MHz Power range: 0-200 W ± 5% Test functions: Fwd / Rev Power, SWR Insertion loss: 0.3 dB or lower Impedance: 50 ohm Power source: "AAA" battery or a Micro USB port Connector: SO239 "M" Type or "N" Type Dimension: 70 W x 78 H x 30Dmm Net weight: 220g (without batteries) Measurement: 1. Apply transceiver output to "TX" and antenna or charge to "ANT". 2. "POWER" on for ready to use. 3. LCD display simultaneously show "Fwd / Rev Power and SWR". 4. For back = light, please switch "LIGHT" to "ON". no function in 30 seconds, the backlit will automatically off. Once PTT launched, the backlit will be back. Battery installation: 1. Remove the black screw from the cover to open the back panel. 2. Install 2 pcs "AAA" batteries. 3. Can be used with alkaline or Ni-ca , Ni-Mh rechargeable battery. 4. This unit has no built-in charging circuitry. 5. Be sure to correct polarity of battery. 6. Remove the battery if the unit won't be used in long period. Noted: 1. Can be use both alkaline battery (1.5 V) or rechargeable battery (1.2 V). 2. This unit has no built-in charging circuitry. 3. Be sure to switch off both "Power" and "Light" after use for saving battery power. 4. Accuracy: Over 5W: +/- 5 percent. 1W - 5W: for reference only. Packing list: 1x RS-70 Digital SWR Watt Meter 1x User manual