GOSO Big Button Senior Cell-Phone Unlocked Dual-Sim 2G GSM Quad Band with FM Radio, Flashlight and SOS Emergency Button Large buttons with large readable numbers, 1.77 inch screen that displays large characters SOS button at the back of the phone, will alarm and call the 5 recorded numbers in sequence in case of emergency Unlocked quad-band GSM phone that works with all 2G GSM service providers worldwide Dual sim is a comfortable option for when you travel or work, lets you keep both lines in the same phone