Feature:1. A thoughtful tool to help the haring-impaired to recognize ring coming. With this extra ringer, londer volume of telephone ring can be noticed in noisy places.2. 2 ringer volume to adjust, design with a switch at the side, high and low to choose to meet your needs.3. Battery-free, just connect the amplifier with the telephone, and connect another jack to the wall jack with a cord(Not included), or connect the telephone to the wall with a cord.4. The lamp flasher is offered for incoming call in a dim light environment.5. With back-side hole design for hanging.Specification:Features:A thoughtful tool to help the haring-impaired to recognize ring coming. With this extra ringer, londer volume of telephone ring can be noticed in noisy places. 2 ringer volume to adjust, design with a switch at the side, high and low to choose to meet your needs.Battery-free, just connect the amplifier with the telephone, and connect another jack to the wall jack with a cord(Not included), or connect the telephone to the wall with a cord.The lamp flasher is offered for incoming call in a dim light environment. With back-side hole design for hanging.Specification:Size: 9.5 x 5.6 x 2.7cmWeight: 37g/1.3ozColor: WhiteVolume Level: HI (70DB), LO (60DB)Suitable Connector Type: 6P2CPackage Size: 10 x 6 x 3cm/4 x 2.3 x 1.1inPackage Weight: 40g/1.4ozNote: Cable is not included in the package. You can use your older one. Packing List:1 x Telephone Ringer Amplifier Package List:1 x Telephone Ringer Amplifier