Theproductcontains1freeTS002-PT100-14MM temperaturesensor Old and Upgraded Products are randomly shipped Upgraded products are equipped with small white connectors compatible for sensor. Those who mind, please place your order with caution. Thank you! The proudct can work properly when it connect to an extra power, so , the product does not match any battery. RL-HM035LT LEDTEMP SENSORDigitalMultifunctionTempTach/Hourmeter.Itcanworkon any 2 or 4 stroke gas engine up to 8 cylinders. IthasapowerfulTemp system,RPM measuring system,timing system, as well as some other unique function design. Temp Measuring System Including: measuring current temperature,MAX Temp and setting over temperature warning function, temperature unit display can be set by user, temperature sensor type can be select by user, etc. RPMMeasuringSystemIncluding: measuringcurrentengineRPM,recordingandviewingengineMAXRPM,andsettingoverspeedwarningfunction,RPMrefreshrate0.5S ,etc. TimingSystemIncluding: accumulatingtotalrunninghoursTOT,recordingpartialrunningtimeJOB,maintenancetimercanbesetfreelyto0-200hoursSVC,etc. UniqueDesignIncluding: easyinstalled, save all data aumatically,waterproofRateIP67,etc. Inaddition,theproductshavegotCEandROHScertification.IthasapatentbothinChina.