2 in 1: 1， Finder/Locator: remotely locate keys or other misplaced things by discrete beeps and LED indicators. 2， Tracker: closely monitor/track two devices' safe distance and ambient temperature. High quality， wide operating temperature range (as low as -40C/-40F)， small size， light weight， durable construction， reliable tracking range， 3 range settings for tracking. Stand-alone System (no incurring costs or monthly subscription fees) with unique private digital signatures， long battery life， good penetration to obstacles (walls， vehicles， trees， snow， debris)， >+40C temperature alert， 90-97dBA discrete beep alarms. Single cost-effective "AAA" battery; works inside pocket， backpack， purse， building， tunnel， boat， forest， cave， debris. NOT a GPS， cellular， Bluetooth or Wi-Fi device; no need of dedicated Wi-Fi or cellular coverage or smart phone connection. The Finder/Locator + Tracker consists of two matched wireless devices with unique private digital signatures. When configured as finder/locator， pressing the button on one device can remotely turn on discrete beeps and bright LEDs on the other device. When configured as tracker， one device is closely tracked/monitored by the other device. When the distance between them exceeds a preset range， alarm beeps will go off. On the other hand， when the tracked device is approached within the searching range， the other tracking device will indicate. It can be a useful tool to narrow down the searching range. The devices have a temperature sensor inside. Once the ambient temperature exceeds +40°C/+104°F that may be an unusual condition， alarms will go off.