Technology glossary
Garmin's name for a sapphire lens that carries solar-charging cells.
Garmin presents Power Sapphire on Enduro 4 as a scratch-resistant lens, mentioned together with the watch's solar charging. Solar charging helps feed the battery while the watch is in use.
According to the manual, the watch does not charge from the sun while connected to an external power source or when the battery is full; charging may be limited or stopped in extreme temperatures. Garmin's solar battery figures rely on assumptions such as 3 hours per day outdoors at 50,000 lux in smartwatch mode.
Smartwatches · 2026
A solar-charging GPS watch built for long battery life. It offers a sunlight-readable MIP display, multi-band GPS, preloaded maps, 64 GB of storage and an LED flashlight. The display is less vivid than AMOLED; there is no speaker or microphone, LTE or satellite messaging.