The Eversense CGM uses a 90-day implanted sensor that is placed in the upper arm in a 5-10 minute in-office procedure. A rechargeable transmitter device is worn on top of the skin, directly over the sensor, which powers the implant and sends the current glucose value and trend arrow to a smartphone. The transmitter is removable (users can take it off/put it back on without wasting a sensor), though it must be on in order to get glucose readings.