Place your bedshaker where you can feel it, under your pillow or cushion for a silent, vibrating alarm. Ideal for people with hearing impairments, or those early morning calls when you don't want to disturb your partner. Connect the Bedshaker jack into the socket on the back of the Clearsounds CSC50 Freedom phone, your Clearsounds Wake n' Shake Alarm clock, your Clearsounds Clear n' Loud Telephone Signaler or your ClearSounds ClearRing 95dB Amplified Ring Signaler. Covered under a 1-year mfg warranty.