HT1 User’s Manual1.5.2 Keypad CombinationThe following table indicates how to quickly execute useful functions usingnumeric keypad combination. Press and hold the key, and then pressthe corresponding key to execute the desired function.Key Description++Keypad backlight toggling+ Increase screen backlight brightness+ Decrease screen backlight brightness+ Scan Service12 © 2017 unitech Electronics Co., Ltd. All rights reserved.unit ech is a registered trademark of unitech Electronics Co., Ltd.