The Horstmann Economy 7 Quartz Immersion Heater Control is a programmable thermostat with a 7-day schedule, designed for electric water heaters. Made of white plastic, this wall-mounted control features a rectangular shape with a 1.76-inch display. It is compatible with other Horstmann products and can be controlled via a smartphone using Bluetooth or Bluetooth Low Energy technology. This timer-equipped device offers automatic system switching and is powered by 230V of line voltage, making it a convenient and efficient addition to any smart home heating system.