6 Security ProtectionEquipped with electric protection of overcurrent, overvoltage, overcharge, overload, overheat and short circuit, it’s more reliable and safer to use.Voltage DetectionMonitor your car's voltage in real time. Below 12V: Need to replace battery.12.0V-12.8V: Normal voltage for a car that's NOT started.13.0V-14.8V: Normal voltage for a car that's started.Voice GPS NavigationWith navigation broadcast function, it helps drivers find their destinations more quickly and conveniently.Mini and PortableMeasured 7.5x3.5x3.5 cm/3x1.4x1.4 in with light weight, it’s compact and space-saving for your car.Guidance for LED Ring Light Double press CH button to turn on/off the blue LED ring light. The blue LED ring light will flash for Bluetooth pairing after power on, and it will stay on after successful pairing. However, it will turn off if it’s unconnected in 5 min and keep waiting for pairing. SpecificationsWorking Distance: 5 m/197 in FM Tuning Range: 87.5 MHz-108.0 MHz Compatible Audio Format: MP3.WMA.WAV.FLAC. Compatible Bluetooth Protocol: A2DP/AVRCP/HFPQuick Charge Port: Support QC3.0 Protocol (DC3.5-6.5 V/3 A, 6.5-9 V/2 A, 9-12 V/1.5 A)Package Includes1 x Bluetooth FM Transmitter1 x User Manual