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SOS Button BISTEE Wireless Caregiver Pager with IP55 Waterproof for Home Nurse Caregiver Alert System with Wireless Range 260ft (1 SOS Button+1 Receiver) Neck Strap Included Wireless Caregiver Pager SOS Call Button Nurse Call Alert Caregiver Pager with IP55 Waterproof for Caregiver Alert System Neck Strap Included Features of Receiver Features of SOS button Voltage of plug- in receiver: 110V IP55 waterproof Expandable to multiple smart receiver or transmitter: < up to 20 Working Range: 260 ft Working power of remote control: