ShakeandVibrate Bed Shaker and Vibrating Alarm 12V DC with 2.5mm x 5.5mm Barrel Plug + Adapter 2.5mm x 5.5mm Barrel Socket to 3/8" RCA Telephone Jack

The Shake&Vibrate(TM) Bed Shaker is designed to alert a sleeping, inattentive, or hearing impaired person by its powerful vibration. This reliable device is easy to use, and very effective. Place the bed shaker under the sleeper's pillow, or between the bed mattress and its box spring. Attach/plug it to any 12V DC alarm device using its 2.5mm x 5.5mm barrel plug or the provided 3/8 RCA telephone jack adapter/connecter. The power cord is 2 meters (78 inches) long. No batteries are needed. When the alarm device is activated, the vibration is felt by and alerts the user. The Bed Shaker can be used with an alarm to wake the sleeping user (such as an alarm with an appropriate 12V DC socket), or with Telephones for the Hearing Impaired, Alarm clocks, etc. which provide a switched 12V DC 400mA power outlet with a barrel socket (2.5mm x 5.5mm) or 3/8 RCA telephone socket. NOTE: This Bed Shaker alarm can be used with a 110V-120V AC power source by separately purchasing the DryBuddy 120V to 12V DC 500ma Power Supply. This Power Supply has a barrel socket into which the Bed Shaker's barrel plug will fit. The Power Supply can then be plugged into an 110V-120V AC 60Hz power source (such as the electric line in a house in the U.S. and Canada) which is switched by an alarm device. This Power Supply can be found on Amazon by searching for DryBuddy DB-PS120 . Note: This bed shaker requires a 12V DC 400ma power supply to work properly. Please verify that your alarm device will provide this power, else the bed shaker will not work properly. Help Amazon by keeping reviews honest, trustworthy and sensible. Thank you.