Some phones have displays on both the handset and base, some on just the base or just the handset. Some displays are illuminated to help you read them in dim light. Nickel-Metal Hydride batteries can offer up to three times the capacity of the same size standard Nickel Cadmium batteries. Due to their increased capacity and energy density features, users can expect longer talk time and longer standby time. Some phones can also be programmed to prevents outgoing long-distance calls or calls to individuals or groups of numbers you choose.
Some cordless phones allow multiple handsets and charging cradles.
Cordless phones use FM radio signals to carry voices and information between base and handset. They are susceptible to interference from electrical devices, other radio transmitters, and other cordless phones. In the United States, the first cordless phones operated in the 27MHz band and later the FCC allowed use of frequencies in the 46 to 49 MHz band, the 900MHz band, and the 2.4GHz band. In general, phones operating at higher frequencies cost more money and have better voice quality, but there are exceptions to this rule. Don't believe advertising claims about 2.4GHz phones providing extra long range.