Qoolife Rechargeable Submersible Pool Lights with Remote, Waterproof Underwater Charging Battery Operated Controlled 25 Color Changing LED with Magnet (2 Pack)

A hot tub lit from inside looks different from one lit from above: the water itself glows and the steam above it catches the color. Many tubs, especially older and smaller ones, have no light in the shell, and these Qoolife pucks fill that gap without wiring. Each one is a sealed disc about 3.3 in (8.4 cm) across with a 2600 mAh battery and a magnetic charging port, and a single RF remote sets all of them to one of 25 static colors or five moving modes.

They fix with a magnet base that sits on suction cups or the included adhesive. In a hot tub, suction cups on a smooth wall below the waterline are the cleaner choice – away from the jets, the filter and the skimmer. The listing names spas among the uses but gives no temperature limit for hot water and two different water ratings, so treat them as lights you put in for the evening and take out afterward, not fixtures.

Tip: Skip the color shows and pick one warm amber or soft white at a low setting – one steady color under the water is what makes the steam glow in a photo.