Quectel L80-M39 GPS Receiver. Supported Bus Interfaces: UART. Number of Channels: 22 (Tracking), 66 (Acquisition). Acquisition Sensitivity: -148dBm. Tracking Sensitivity: -165dBm. Dimensions: 16 x 16 x 6.45mm. Height: 6.45mm. Length: 16mm. Maximum Operating Temperature: +85°C. Minimum Operating Temperature: -40°C. Width: 16mm.