13-in-1 Digital Hygrometer Indoor Outdoor Thermometer with 3 Remote Sensors Multifunctional Weather Clock Wireless Temperature Humidity Monitor Gauge with 60M Range Specifications: Quantity: 3 Pcs Sensors, 5 Pcs Sensors (Optional) Material: ABS Thermohygrometer Voltage: 3.7V  Sensor Voltage: 3.0V Thermohygrometer Current: 280mA; Power: 1 W Sensor Current: 60μA; Power: 0.18 mW Thermohygrometer Battery: 3.7V, 18650 Li-ion, 2000mAh (Included) Charging Time: 2-3 hours Working Time: 6-7 hours Sensor Battery: 2 * 7 dry cell, 3V (Not Included) Temperature Measurement Range: -20~55°C Temperature Measurement Error: ±1℃ Humidity Measurement Range: 1%~ 99%RH Humidity Measurement Eerror: ±3%RH Charging Method and Interface: DC5V 1A/2A Type-C USB interface Thermohygrometer Size: 89 * 83 * 36mm / 3.50 * 3.26 * 1.41in Sensors Size: 59 * 59 * 19mm / 2.32 * 2.32 * 0.74in Thermohygrometer Weight: 165g / 5.82oz Sensors Weight: 40g / 1.41oz Package Weight: 396g / 13.96oz Package Size: 19.5 * 16 * 7.2cm / 7.67 * 6.29 * 2.83in