Experience comprehensive and diverse functions with our advanced telephone system. This device features fully hands-free intelligent backlight control, allowing for seamless operation in any lighting condition. Store up to 3 emergency numbers for quick access, and enjoy adjustable ringtone volume with a convenient switch. The light indication feature ensures you never miss a call, while the one-click hearing aid function and a 20dB increase in handle reception make it ideal for individuals with hearing impairments. Adjustable Volume and Ringtone Customize your experience with adjustable volume settings for the electronic ringtone. Tailor the sound to suit different environments, ensuring clarity and comfort. The controller's sound can be amplified by 20dB, making it perfect for those who need extra assistance with hearing. Incoming Call Features Stay informed with the incoming call indicator light that flashes when a call is received, making it easier to answer promptly. The incoming call ringtone is also adjustable in volume and can be turned on or off with simple button controls, providing a user-friendly experience. Backlight Display System Our telephone continues to function even when connected solely to the telephone line. To activate the screen backlight display, simply insert a battery located at the back of the device. Detailed instructions are conveniently marked on the back for your reference. Important Note Please note that this is not a wall phone. The telephone line access port is located at the top of the phone, while the receiver handle access port is on the left side. Ensure correct connections to avoid functionality issues.