LDG Electronics FT-METER presents a lush, highly readable 2.5" meter face with calibrated scales for signal strength and discriminator reading on receive, and power output, SWR, modulation, ALC action and supply voltage on transmit. For the FT-857D and FT-897D 2 year warranty Receive: S-Meter, Discriminator or Voltage - Transmit: RF Power, SWR, Modulation, ALC or Voltage - Cable length 3 feet Sensitive 500 uA meter movement - Externally powered cool blue backlighting - On/Off switch for backlight. Backlighting requires 11 to 15 volts, 100 mA - Size: 3.6W x 3.0 D x 2.6H inches Weight: 0.5 lb. For use with FT-857(D) and FT-897(D) only.