Model Number: WR-3 Key Specifications/Special Features: WR-3 adopts 433/868/900MHz wireless technology to ensure better performance for barrier penetration and achieving long range transmissionSensors start sending data when wind cups revolveSensor will go to sleep mode when wind cups stop revolving for more than 6 hoursData transmit rate: every 2 secondsUltra-long 400 meter transmission distance makes WR-3 a perfect gadget to help you monitor wind speed on crane and prevent from high wind risks Main Export Markets: AsiaAustralasiaNorth America