UPDATE: Almost all customers buy 4 or more, remember that the more you buy the bigger the discount and the more impressive it is in the pool. With the Underwater Pool Lights you can illuminate your pool with10 colorsfor different occasions. Purple, red and green are amazing forparties of dreamswhereas blue and white are excellent forrelaxing nights. *Be sure to screw the cap clockwise and tightly before putting it in the water. *When the battery runs out, the lights stay red, if they no longer change between colors and the remote control stops working, replace the battery. *The maximum depth to reach is recommended to less than 2 m.