The Antari W101 Wireless High Output Bubble Machine is equipped with the “Double Bubble Wheel” designed to produce a solid, plentiful amount of bubbles continuously. The W-101’s reservoir holds 1-liter of bubble liquid that will keep making bubbles for up to 2 hours continuously. Just plug in, fill up and the unit instantly produces bubbles. Easy refills and the included hanging bracket makes the W-101 very user-friendly.Another innovation is the learning-mode of the wireless function. Each receiver can memorize up to 5 sets of frequencies and all receivers can receive signals from any registered transmitter. The wireless controller comes standard… “The Antari W101 Wireless High Output Bubble Machine is equipped with the “”Double Bubble Wheel”” designed to produce a solid, plentiful amount of bubbles continuously. The W-101’s reservoir holds 1-liter of bubble liquid that will keep making bubbles for up to 2 hours continuously. Just plug in, fill up and the unit instantly produces bubbles. Easy refills and the included hanging bracket makes the W-101 very user-friendly. Another innovation is the learning-mode of the wireless function. Each receiver can memorize up to 5 sets of frequencies and all receivers can receive signals from any registered transmitter. The wireless controller comes standard.”