C20 Caregiver Call Button EU Plug Wireless Emergency SOS Smart Doorbell Nurse Call Bell 2 Call Buttons and 1 Receiver for Elderly at Home - Black •Emergency button screwless chuck design,it's waterproof and dustproof even without a rubber ring •Receiver: AC socket,EU plug supports 110-240V voltage •The SOS call button uses a CR2032 battery •SOS button receiving distance: open area receiving distance up to 80 meters •38 Songs to choose from. 4-level volume adjustable (including silent mode) •Easy to use. Just plug the receiver into an outlet,all the seniors/disabled/bedridden need to do is push the panic button to ask for help •It comes with a lanyard,the wearable call button can be hung around the neck,and also can be attached to the walker/chair/bedside •Note: •The transmitter shown in the picture is for rendering only (not included). •The wireless signal can be affected by obstacles. The more obstacles,the more serious the loss of signal. Specification: •Call button size: 60x34x11.5mm •Receiver size: 90x56x20mm Package included: •1 x Receiver •2 x Call Buttons •1 x English User Manual •Other things not included