A recessed activation button and voice confirmations during dialing prevent accidental activation. No monthly subscription or service fees apply! Included duplex jack allows a second phone to share the same phone outlet. With an astounding range of 600 feet from base unit, the compact battery-powered pendant weighs only 6 ounces and measures 4 inches high, 2 inches wide and inches thick. Replaceable AAA battery (included) lasts 1 year in standby or provides up to 30 minutes of talk time. Water-resistant. Instructions included.