Adjust the brightness (TRX7 & TRX7CS) Richard TRX April 13, 2018 00:06 Updated Follow Slide your finger downward from the top right corner of the screen. Tap the Brightness icon. Slide the circle in the Brightness indicator to the left (to decrease brightness) or to the right (to increase brightness). Related articles Mark a waypoint with point on map Change unit of distance measurement Can I plug my TRX into my vehicle power supply? Connect to WiFi Comments 0 comments Please sign in to leave a comment.