The backlight is very bright and it includes both power cable as well as battery backup. It’s smart enough that when I disconnect the power it dims the backlight on battery, and has a touch button on top to light up for 10-15 seconds on battery power to make it easy to read while still conserving battery.
https://www.amazon.com/Newentor-Weather-Station-Wireless-Thermometer/dp/B0866H6CL4

