Feature:1. *433MHz frequency, wireless transmission is more than or equal to 100 meters in open place. Low-consumption design, which can make it work long time.2. *Our nurse caregiver SOS emergency call button alert system for patient, disabled, elderly and children is simple to use and provides peace of mind.3. *Ideal for use as an alert aid for elderly, pregnant woman, children or disabled who can\u0027t stand up from toilet, bathroom fainting, floor mat fall alarm or heart attack, emergency call for help.4. *Simply press the call button to alert the caregiver via the receiver or wireless alarm host. Widely used in home, hotel, hospital, retirement home and other needed places.5. *Call button can be wall mounted beside bedside, sofa, closestool or placed near caregiver.Specification:Note: The SOS Emergency Button should work with the alarm system host or Sonoff RF Bridge 433.Features: *433MHz frequency, wireless transmission is more than or equal to 100 meters in open place. Low-consumption design, which can make it work long time.*Our nurse caregiver SOS emergency call button alert system for patient, disabled, elderly and children is simple to use and provides peace of mind. *Ideal for use as an alert aid for elderly, pregnant woman, children or disabled who can't stand up from toilet, bathroom fainting, floor mat fall alarm or heart attack, emergency call for help. *Simply press the call button to alert the caregiver via the receiver or wireless alarm host. Widely used in home, hotel, hospital, retirement home and other needed places.*Call button can be wall mounted beside bedside, sofa, closestool or placed near caregiver. Specifications:Item Type: Wireless SOS Emergency ButtonFrequency: 433MHzEmission protocol: 1527Power Supply: Button Battery (included)Work Current: 9-12MABattery Working Time: 8-12 monthsTransmission Distance: 100m(Open space)Installation Way: Wall Mounted(with screws or sticker)Installation Height: 0.8m-1.2m (Suggested)Color: White+RedMaterial: ABSOperating temperature: -10°C to 50°C Item Size: Approx. 46*46*16mm(L*W*H)Item Weight: Approx. 16g / 0.56ozPackage Information:Package Size: Approach. 5 * 5 * 2cm / 2 * 2 * 0.79inPackage Weight: Approach. 18g / 0.63ozPackage List:1 * SOS Emergency Button1 * StickerPackage List:1 * SOS Emergency Button1 * Sticker