Vktech Car Digital Thermometer DS-1 with Two Probes Measuring Temperature  and Two probes measuring two-way temperature,clock function, attractive appearance Power supply: DC1.5V LR44 button battery Temperature Measuring range: -50 - 70 (-58-158) Resolution: 0.1(&gt;-20),1(-20) External sensor length: 1.5m,Products size: 118x30x28.5/mm