The Panasonic KX-TCM420B is a cordless telephone system that includes a base unit and a handset. The device operates using wireless radio waves to transmit calls between the two units. Before initial use, it is recommended to charge the rechargeable Ni-Cd battery for approximately 10 hours.
Charge the battery for about 10 hours before initial use.
The rechargeable Ni-Cd battery must be charged for about 10 hours before initial use.