Riversong Jelly Kids GPS tracker has a slew of useful features. It lets you track the location of your kid, make two-way calls, send SOS alerts, block unknown numbers and more. This watch has a SIM card slot and supports a 2G micro SIM card. There is a microUSB charging port too. You can add up to 30 contacts to the RS Jelly app, which is used to pair the smartwatch with your phone. Take a look at our hands-on video of this kids GPS tracker.