Elitech’s ATC-1550 is a pre‑wired digital temperature controller built around a single NTC probe input and touch‑key interface. It provides automatic switching between heating and cooling with two switched outlets, plus a dedicated lighting output per the brand’s UK listing. The controller covers −40 to 99 °C with 0.1 °C resolution and ±1 °C accuracy from −30 to 50 °C (±2 °C outside), and its panel carries an IP65 protection rating. User functions include temperature calibration, compressor delay, adjustable heating/cooling hysteresis, defrost time and cycle settings, one‑key factory reset, and audible/visual alarms on over‑limit or sensor fault. Relays are rated 10 A at 220 VAC. Versions with UK, EU, and US plugs are offered for applications from greenhouses.