Cappec's Wireless Thermoblue - Bluetooth Temperature and Humidity Weather Station. Built in Thermometer and Hygrometer. Transmits Wireless to Your iOS or Android Device. Cappec's THERMOBLUE - Bluetooth thermometer and humidity sensor Thermometer and Humidity Sensor for in- and outdoor use. Batteries are included. Transmits data through Bluetooth 4.0 BLE. Can connect up to 4 sensors at the same time Distance can reach up to 100 feet/ 30m in open range