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 2.7cm Weight: 37g/1.3oz Color: White Volume Level: HI (70DB), LO (60DB) Suitable Connector Type: 6P2C Package Size: 10 x 6 x 3cm/4 x 2.3 x 1.1in Package Weight: 40g/1.4oz Note: Cable is not included in the package. You can use your older one. Packing List: 1 x Telephone Ringer Amplifier