1.Measure Top Speed, Average Speed, and Top Altitude; 2.Concurrent reception of GPS & GLONASS; 3.GNSS Coordinator; 4.Update frequency up to 10Hz; 5.Built-in 1M flash (recording time: 2 hours); 6.UTC timestamp logged for each track point; 7.Built-in rechargeable, LiPo battery 200mAh (Operating time: 150 minutes); 8.Switch between Metric and Imperial system of Measurement; 9.GNSS LOGGER software for device management and data logging on Maps; 10.Firmware upgradeable. Concurrent reception of GPS & GLONASS Receiver: L1, 1575.42 MHZ Update frequency: 10 Hz. Antenna type: Built-in Satellite signal reception sensitivity: -167dBm Operating temperature: 0℃ to 40℃ Storage temperature: -10℃ to 70℃ Operating humidety: 5% to 90% Colour:Black Material:plastic+metal type:GSM020 Package Contents: 1 x Speed Meter Only 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.