The only difference between Baby Monitor 2 and Baby Monitor 3 is that the Baby Monitor 2 has two types of temperature modes, one is the Feeling Temperature, and the other is the Skin Temperature. Baby Monitor 3 can detect the Feeling Temperature only. However, the sensor in Baby 3 has an upgraded chip and its connection is more stable.
If you have any further questions, feel free to contact us via in-app Feedback(from the Sense-U App->Setup->Help->Feedback) for expedited diagnose, or email us at support@sense-u.com for general questions.