The waterproof WhistleGPS retains the same 38 mm diameter by 10 mm high form factor and all of the features of the original device. The addition of GPS capabilities and connection to the Sigfox network allows users to locate their pet at any time on iOS or Android devices for a monthly subscription of US$5. Whistle says this is the lowest monthly fee of any GPS pet tracker on the market .
The network, which relies on Ultra Narrow Band based radio technology and uses sub-GHz frequencies (902 MHz in the US and 868 MHz in Europe), offers two-way communication at much greater range than Wi-Fi and Bluetooth, but at a lower bandwidth of around 100 bits per second. It is also low power and able to support millions of connections, making it suitable for connecting a wide range of low-bandwidth devices to the IoT ... such as the WhistleGPS.The company has now added GPS capabilities to allow the tracking of location to the device, as well as making it the first consumer product to tap into Sigfox's low-power Internet of Things (IoT) network.