Product: 2PCS 95dB Extra-Loud Telephone Ringer Phone Ring Amplifier Ringing Help Strobe Light Bell Sound Landline Ringer Sound Ringtones
Brand: Shinekoo
Installation:
 1. Please connet the C/O ring plug with ringer's jack.
 2. The ringer's plug connet with telephone.
 3. There are high,low switches for your selections.
Note: There is no cable in our package, you can use your older one. The instruction is in our image, very simple to use. If you have any further question, please feel free to contact us. Thanks.
High Low switches for ringer sound.
To increase the volume of telephone ring in noisy places.
To help the haring-impaired to recognize ring coming.
The lamp flasher is offered to avoid the ring noise in a quite environment.

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