RovyVon E3 Keychain Flashlight Max 550 Lumen with Dual LED 6500K Cool White&4000K Warm White, USB-C Rechargeable Keychain Flashlight, Dual Power by Built-in Li-po/Replaceable AAA Battery(Aqua Blue)

Continuously light output when replacing the AAA battery.

Automatically switch battery: AAA battery installed OR one of the battery is low voltage.

USB-C rechargeable (charge the built-in Li-po battery only).

Different battery indicators to help you know the battery being used and the power level in time.