•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: 200mAh 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) •5 x Call Buttons (with Hanging Rope) •1 x EU Power Cable •1 x English and Chinese User Manual •Other things not included