Easy-to-use external receive display SWR power meter. Sturdy and durable metal shell, non-slip pad, high quality, stable performance. Features: 48cm long cable for easy connection. Compatible with YAESU FT-857 and FT-897. SWR power meter external pointer receive display meter, it displays SIG, PWR, WER, MOD, VOLT and DISC. Iron shell is sturdy and durable. 4 anti-slip pads ensure stability. Receiving display settings: (1) long press [FUNC] to enter the Settings menu and enable the extension menu; (2) rotate [SELECT] to bring up the Settings menu item no-060 [MTR ARX SEL]; (3) rotate [DIAL] to select what is displayed on the external meter (SIG- input signal strength display, CTR- discriminator center meter, VLT- battery voltage, N/A- blank, FS, OFF- turn off the meter); (4) long press [FUNC] to save the settings and exit. Emitting display settings: (1) long press [FUNC] to enter the Settings menu and enable the extension menu; (2) rotate [SELECT] to bring up the Settings menu item No-061 [MTR ATX SEL]; (3) rotate [DIAL] to select what is displayed on the external meter (PWR- transmit power display, ALC- automatic level control voltage display, MOD- modulation level display, SWR- voltage standing wave ratio display, VLT- supply voltage display, N/A- blank, OFF- turn off the meter). Calibration: (1) long press [FUNC] to enter the Settings menu and enable the extension menu; (2) rotate [SELECT] to bring up the Settings menu item No-060 [MTR ARX SEL]; (3) rotate [DIAL] to select FS; (4) use a small flat-head screwdriver to adjust the calibration adjustment hole at the back so that the dial pointer points to the full scale; (5) finished. Note: 1. If you can't find the No.60, No.61 Settings menu item, that's because the radio hides them. Please long press F key to enter the Settings menu, set NO.1 menu to ON and press F to exit and save. 2. Size and color may be slightly different due to manual measurement and different light conditions. Thanks for understanding. Specifications: Color: Black/ White (Optional) Material: Iron + Plastic Item Size: 67 * 65 * 72mm / 2.64 * 2.55 * 2.83in Cable Length: 48cm / 18.90in Item Weight: 265g / 9.33oz Package Size: 12 * 9 * 7cm / 4.72 * 3.54 * 2.76in Package Weight: 307g / 10.81oz Package List: 1 * SWR Power Meter External Receive Display Meter