[3 One-Touch Emergency Dialing] Pre-programmed photo buttons let you quickly call loved ones or emergency contacts(No dial tone is normal when setting up one-touch buttons). Our big-button phone for seniors features large, high-contrast buttons that are easy to see and press, reducing eye strain and confusion ^^ [Adjustable Volume and Hand Free] The ringer has 3 adjustable levels: OFF-LO-HI, with a maximum volume of 110dB for easier call detection. The handset volume is also adjustable in 2 levels: LO-HI, allowing you to choose the most comfortable setting. The hands-free has 2 adjustable levels: LO-HI, with a maximum volume of 100dB ^^ [Flashing LED Indicator] Equipped with a bright LED incoming call flashing light, making calls more noticeable. Even in noisy environments, the LED light ensures you won't miss important calls. Please note that this product does not feature a display screen, so it does not support call ID functionality ^^ [No Battery or Power Required] Simply plug in the RJ11 phone line to start using itno batteries or external power source required. Please note that this telephone cannot be directly connected to the internet for use, and do not have an answering machine function and do not support voicemail or message recording ^^ [Please Note] If your phone can receive calls but cannot make outgoing calls, the issue may be due to the dialing mode setting. In most cases, switching to Tone mode (T) will resolve the issue