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Cordless phones operate on frequencies mandated by the FCC. There are four major frequency band options: 43-50 MHz, 900 MHz, 2.4 GHz, and 5.8 GHz. Cordless phone bases and receivers operate over two closely located, but different, radio frequencies.

DECT phone is a cordless phone that works with your landline phone line.  A DECT phone has a base and one or more handsets. The base phone is like any telephone set, with a PSTN phone line connected to it. It radiates signals to the other handsets, wirelessly connecting them too to the PSTN landline.

A cordless telephone or portable telephone is a telephone with a wireless handset that communicates via radio waves with a base station connected to a fixed telephone line, usually within a limited range of its base station (which has the handset cradle).

Cordless phones can be more of a health risk than cell phones. EMF radiation from a cordless phone charger/base stations, especially new models (DECT), even when you are two meters away from the base station is 50 times higher than Scientists consider to be a safe level.

The batteries in smartphones are getting larger and larger, promising cell phones that can go on all day with just a single charge. Some of the cell phones with long and great battery life include Cat S41 with a battery life of 15 hours 19 minutes, Moto E4 Plus with a battery life of 14 hours 48 minutes, Huawei Mate 10 Pro with a battery life of 14

When a person speaks into a telephone, the sound waves created by his voice enter the mouthpiece. An electric current carries the sound to the telephone of the person he is talking to. A telephone has two main parts: (1) the transmitter and (2) the receiver. It lies behind the mouthpiece of the phone.