DTMF/FSK CLI Compatible. 16-digit LCD display with Blue backlight. 37 Incoming calls memory (Dynamic memory). 37 VIP calls memory (Dynamic memory). 15 Outgoing call memory (Dynamic memory). 10-One touch memories. Programmable flash time. Tone /Pulse dialing mode compatible. Music on Hold. 16 Ring melodies. 4 - Level ringing volume control. 2 - Way Speaker function with adjustable volume. Do Not Disturb function. DTMF/FSK compatible with auto -detection. 3 - Alarm clock setting). 5-levels of. LCD contrast adjustable. Anti-steal dialing function. Mechanical key Lock function.