Once the cell dies, it loses all of its charge and cannot activate the phone's fingerprint sensor, and of course does not open the lock.
Recently, the trend of designing smartphones with user-friendly overflow screens has paved the way for new sensor technologies.
Synaptic officially launches new biometric technology on the first day of the Consumer Electronics Show CES 2017.
NTT DoCoMo's products help solve one of the great difficulties of foreign visitors to Japan, which is to read Japanese menus in restaurants.