YSTD&reg; Mini Thermometer Hygrometer Temperature Humidity Meter Digital LCD Display (Black) Dimension: 4.7x2.8x1.5cm(approx.) Operating voltage: 2 x 1.5V button LR44 batteries (Not included) LCD dimension: 3.6x1.7cm(approx.) Cable length: 1.5m Probe length: 5.8cm