With the BT Graphite 2500 Twin DECT telephone you can cut your phone’s running costs by up to half with its energy efficient power supply. The power supply unit is specifically designed to use up to half the amount of energy compared to previous models non ECO models. Other features to those listed include: Digital answer machine, message playback on handset & base, 2 outgoing messages, recordable outgoing messages, answer delay, time saver, remote access, message advice indicator & counter, call screening, memo function, conference call, call transfer & internal calls, all on multi packs, 5 standard handset ringtones, handset ringer on or off, handset ringer volume control, associated ringtone, 5 base ringtones, base ringer on or off, base ringer volume control, auto answer, secrecy function, handset naming, keypad lock, earpiece volume control, handsfree volume control, call timer, clock, alarm, keypad confirmation tone, low battery indicator, low battery alert, out of range alert, upto 10 hours talktime & upto 100 hours standby time.