The LED night lamp is equipped with a 1800 mAh rechargeable battery allowing up to 15-20 hours usage, you may connect the lamp to wall outlet all the time as a regular bedside night lamp. You may disconnect it as needed and carry the portable lamp during the night for extra safety The nightstand lamp is built-in a touch sensor dimmer with 3-levels of brightness which make it easy for you to change the brightness by tapping the lamp. The lowest setting generates a gentle light for better sleeping. Its highest setting provides extra brightness for comfort reading or nursery purpose without disturbing your sleeping partners or babies It comes with an USB adapter for charging even if you lost or forgot to bring its adapter, you can still charge the lamp by connecting the cable to any USB ports, including laptops, computers, power banks, wall outlets, or power strips This novelty lamp has a sleek and low-profile design which adds a mood light to embellish your home or office without taking too much space. With its built-in battery, you can place the light to anywhere, your nightstand, shelves, desk, side table, dining table and so much more