No monthly fees required for the watch to function. Please check with your preferred carrier for cell phone plans. Ensure you get a new, independent phone number for the watch and NOT a "wearable" or "add-on" plan to an existing number.
It's about 48 hours. Depending on the network signal in your area, there will be differences in the area where the signal is poor, and the battery life will be shorter because the searching signal will consume more power. In general, Naomi's battery life varies by use, configuration, cellular network, signal strength, and many other factors; actual results will vary.
The IP67 rating means that Naomi is protected from dust and capable of withstanding water immersion between 15 cm and 1 meter for 30 minutes. However, we do not recommend wearing the watch while taking a shower, diving and swimming, as the waterproof parts of the watch may age over time, resulting in reduced water resistance protection.