Suitable for On / Off Relay Control Support Three-speed Fan Coil Control and Energy-saving Mode with Keycard Application in Hotels Power Supply:95~240 VAC, 50~60HZ Support Power-off Storage With Clock Display Function External NTC / Temperature Sensor, Enabling Intelligent Control and Safety-energy Support Adjustment Target Temperature Error to Control Valve Status Support Customized Temperature Settings for Both Weekday and Weekend (Saturday & Sunday) with Six Programmable Periods Maximizing Comfort and Economy Ultra-wide-distance Wireless Transmission up to Line of Sight of 15 km Highly Adapt to Different Scenarios with 86mm Hidden Box and European 60mm Round Box IP20 Rated Display Temperature: +5°C ~ +99°C Ambient Temperature: 0°C ~ +45°C Storage Temperature: -5°C ~ +45°C Relative Humidity: 5 ~ 95% (Non-condensing) Power Consumption: <1.5W