No cellular signal or internet requiredAccurate Metrics: Get detailed latitude, longitude, altitude, and speed information.Real-Time Tracking: View precise GPS locations instantly.Offline smartphone app iOS/ AndroidMulti-Device Support: Track multiple transmitters in one app, and includes additional features like data logging, battery monitoring, and AES128 encryption for secure tracking.Loko's proprietary smartphone application functions completely offline, displaying locations on a 2D map for easy navigation and recovery. No monthly fees, 15+ km range (tested in open area), and up to a year battery life in a single charge (Air unit). Tracks up to 30 Air units per Ground unit (Multi Connection). Offline Maps: Navigate with pre-downloaded OpenStreetMap areas-no internet required. Archive History: Access saved tracking data by date. History Management: Delete tracking data easily from the app. Balloon Mode: Activate for GPS functionality up to 80 km altitude from sea level. Frequency modes (software selectable): EU868/US915/AU915/AS923/KR920/IN865.Color: As ShownMaterial: ABS+Aluminum AlloyPackage Contents:1*Tracker KitOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.