Before buy please read this notice: All Our Products has already rechecked and QC passed. Not return policy applicable. No warranty available. If you need any help to operate our product you can send message in chat box. Color: White + Green OR White + Blue Infrared Sensor with Control Circuit Board The Sensitivity and Holding Time Can be Adjusted Working Voltage Range: DC 4.5V- 20V Current Drain: <60uA Detection Range: <140° Buy Online: https://www.giganepal.com/product/ecg-monitoring-sensor-mo