The GNC 255 is available in 3 versions to fit your needs. Each version comes with 25 kHz frequency channel spacing and 8.33 kHz channel spacing. The GNC 255 is available with either 10 W or 16 W of transmitter output, letting you find the right balance of power and price. GNC255A Fixed Wing Standard 10W 8.33, GNC255A Heli Standard 10W 8.33, GNC255B Fixed Wing Standard 16W 8.33, GNC255B Heli Standard 16W 8.33, GNC255B NV Fixed Wing Standard 16W 8.33, GNC255B NV Heli Standard 16W 8.33.