Mobile Phone External Bluetooth Gps L1+l5 Dual Frequency Beidou B1 Glonass L5 Usb Receiver Bluetooth Ble Edr Ovi Interactive Map - Iot Accessories - AliExpress
Dual-frequency GNSS on Android devices | by Sean Barbeau | Medium
GNSS Antenna with 90% Efficiency in GPS/GALILEO/GLONASS/BeiDou L1 bands