The X90 receives GPS signals through satellite transmission.Large obstructions such as the underground parking lot, tunnels, high-rise buildings, etc. will interfere the GPS signal searching, which normally lead to failure to read the speed data. Meanwhile, there is a certain error of altitude data within a range of 5 to 100 meters in low altitudeareas, while the error in high altitude areas can be ignored. The causeof this error is related to satellite signals.3-5 days fast delivery from US warehouse. Great value for money. Product Instructions:1. Park the car on a level surface, stick the adhesive on the product,adjust and fix it in the vehicle for easy horizontal view.2. Before driving, connect the power supply and wait to receive the satellite GPS signal until the data shows normal.3. Long and hold the setting button and click the start button to adjust the electronic clock.4. Press and hold the start button, and click the setting button to adjust the time of the X90.Product Parameters:Power: DC 10V-30VWorking temperature: -40℃ ~ +80℃Depression＆elevation angle: -40℃ ~ +40℃Roll angle: -40℃ ~ +40℃Clock error value: ＜1minuteVoltage measurement range: DC 5V ~ 30VVoltage measurement accuracy: 0.5VSpeed accuracy: ＜ 0.36Km/hGPS Cold Boot Time: 32s (Average)GPS Hot Boot Time: 1s (Average)GPS Data Refresh Time: 1sWireless Transmission frequency: 2.4GHzProduct size: 70*59*59(mm)Weight: 203g
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