CTW07 EU Plug Wireless Alert Button Call Button for Elderly Emergency,Alert System for Seniors,4 SOS Call Buttons and 1 Digital Screen Receiver - White ?Easy to ask for help for an elderly person,no need to wake up the whole house; just press the button to ask for help ?Very suitable for patients,elderly,residents,handicapped and pregnant women quickly send alerts to nursing staff ?The maximum wireless transmission distance is 800-1000 meters ?Easy to carry,clip it on your collar; hang it on your neck as a pendant; fix it on the bedside and toilet; convenient for the patient; depends on the requirements ?Meet the needs of all hospitals,clinics,nursing homes,restaurants,hotels Specification: ?Receiver: ?Function: display calling function,calling time,calling sequence ?Power supply: USB interface ?Alert Mode: Vibrate or Beep ?Receive sensitivity: -110dbm ?Frequency: 433.92MHz ?Storage capacity: 20 groups of real-time call information ?Transmission distance: 800-1000 meters ?Battery: 3.7V 230mAh (included) ?Receiver size: 52.3*61.7*16.5mm ?SOS Call Button: ?Battery: CR2032 button battery (included) ?Modulation method: ASK(AM) ?Launching distance: 200m (open field) ?Working: -10??C to 50??C ?RF frequency: 433.92mh ?SOS call button size: 55*30*10mm Package included: ?1 x Receiver (with Hanging Rope) ?4 x Call Buttons (with Hanging Rope) ?1 x EU Power Cable ?1 x English and Chinese User Manual ?Other things not included