Features:Easy to use: First, turn to the right to open the cover, and then pull out the k-ey. After the battery is installed, press the reset button, then rotate the cover to lock it firmly, buckle the k-ey, you can add a tether to the keyhole, put the sensors into water, and ensure that it is in the effective transmission ranges of the display console.Specifications:Material: ABSMeasuring ranges:Host: 0~60Transmitter: -40~60Power for host: 2 * AAA battery (NOT included)Power for transmitter: 2 * AAA battery (NOT included)Accuracy: ±1Transmission distance: 50m (in the open distance)Frequency: 433MHzRefresh rate: 60sHost size: 95 * 90 * 20mm / 3.7 * 3.5 * 0.8inTransmitter size: 220 * 90 * 90mm / 8.7 * 3.5 * 3.5inHost weight: 39.9g / 1.4ounceTransmitter weight: 296g / 10.4ouncePackage size: 230 * 105 * 100mm / 9.1 * 4.1 * 3.9inPackage weight: 434g / 1.0lbPacking list:1 * Host1 * Transmitter