The KX-TGA931T is a mid-range cordless handset expansion for use with an existing phone base, and it is only compatible with Panasonic's KX-TG6300 and KX-TG9300 Series of base units. It uses DECT 6.0 wireless transmission, at a frequency of 1.9 GHz, to avoid interference with other wireless devices. It has a 1.4" LCD display with white backlighting, and backlit keys and a ringer LED. Depending on the base system, this handset is compatible with answering services, handset-to-handset intercom, and message waiting indicators. It uses rechargeable batteries and includes a charge station, and typical battery life is about 5 hours of talk time per 7 hour charge. The handset also has its own independent ringer and volume settings. This unit is almost identical to the KX-TGA930T, with a few very small differences - this version is not compatible with caller blocking, does not have a handset locator, and cannot be used with the KX-TH1200 Series base.