DESC: Protect yourself from identity theft with digital security. Your call is digitized and encrypted, making it nearly impossible for someone to eavesdrop. Excellent range up to 500 feet. Multiple wearing styles over the ear and over the head. 7 hours of talk time. Mute, flash, and volume controls. Accessory headset only. Requires the LS6425, LS6426, LS6475, LS6476, DS6421 series phones to operate; no phone jack required.