1. I found Dexcom as the only FDA-approved Continous Glucose Monitoring System that does not require pricking the fingers.
As of Dec 20, 2016, the FDA “expanded the approved use of Dexcom’s G5 Mobile Continuous Glucose Monitoring System to allow for replacement of fingerstick blood glucose (sugar) testing for diabetes treatment decisions in people 2 years of age and older with diabetes. This is the first FDA-approved continuous glucose monitoring system that can be used to make diabetes treatment decisions without confirmation with a traditional fingerstick test.”
Dexcom: The Dexcom G5 Mobile Continuous Glucose Monitoring System (Dexcom G5) consists of an externally-worn glucose sensor that continuously measures glucose levels and displays the values. In addition to reporting glucose values every 5 minutes, the system reports trending information in real-time for up to seven days (the life of each sensor). It is currently available on Android app users within the US.

2. iHealth Smart is a wireless Gluco-Monitoring System. It also approved by the FDA but it requires pricking the fingers.
(“Health 8G5 and BG5L Wireless Smart Gluco-Monitoring System consist of blood glucose meter, single-use test strips, sterile lancets, lancing device and the control solutions. The new device Health 8G5 and BG5L Wireless Smart Glucose meters are based on an electrochemical biosensor technology (electrochemical) and the principle of capillary action. The new device Health 6G5 and BG5L meters can display the test results itselt, it can also transmit the test results to an iPhone, iPod touch or iPad through blue tooth.”)
References:
https://www.dexcom.com/get-started-cgm?#safety-information
https://www.fda.gov/newsevents/newsroom/pressannouncements/ucm534056.htm
https://www.fda.gov/MedicalDevices/ProductsandMedicalProcedures/DeviceApprovalsandClearances/Recently-ApprovedDevices/ucm533969.htm
https://www.accessdata.fda.gov/cdrh_docs/pdf12/K123935.pdf