The IceCap ATO is a reliable dual optical sensor Auto Top Off management system that monitors and automates refilling evaporated water. Includes everything needed to install and operate.

• Easy to install magnet mount sensor base
• Dual optical sensor design for added safety
• No moving parts to fail
• Integrated fail-safe protection
• Compact design
• Manual top off function
• Plug and play
• Detachable components
• Equipped with DC feed pump
• 1-Year limited warranty

Includes:

• controller,
• 2x optical sensors,
• power adapter,
• DC brushless pump capable of pumping to a height of ~6 feet and a maximum flow rate of ~74 gph and
• 6.5' of water tubing with tubing holder.
• Works in complete darkness

Read more here: http://www.coralvue.com/icecap-ato