Single module without ZeroNote: All modules are tested in firmware, unleashed firmware is recommendedUsing integrated antenna module, no external antenna is required, default baud rate is 9600, NMEA protocolInsert the module and open the GPS nmea app, wait 5 seconds for the battery to charge, and then press the reset button to start searching for stars. The first search is slow and takes about . Please use it outdoors in an open area or near a window.This is a single-screen app, and a few interactions are provided via the hardware buttons:Long press the up button to change the baud rate. The default baud rate is 9600, but 4800, 19200, 38400, 57600, and 115200 baud are also supported.Long press the right button to change speed units from knots to kilometers per hour.Press the OK button to set the backlight to always on mode. Press it again to disable.Long press the back button to exit the app.Due to different batches, the appearance, color and printed words of the product , which will not affect the use.Colour:greenMaterial:PCBPackage Contents:1 x ModuleOnly 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.