YisTech Portable Caregiver Pager Door Alarms for Dementia Patients/Kids Safety/Home Security,Door Sensor Alarm for Elderly/Business/Home/Store/Mailbox (2 Sensor 1 Portabel Receiver) Ready to Drink higher than the upper audible

higher than the upper audible limit of human hearing

) Wrong size would cause it falling out easily or leaking

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Having a flying ball can help keep your kids away from computers and games

YisTech Portable Caregiver Pager Door Alarms for Dementia Patients/Kids Safety/Home Security,Door Sensor Alarm for Elderly/Business/Home/Store/Mailbox (2 Sensor 1 Portabel Receiver) Ready to Drink higher than the upper audibleBrand: YisTech Features: Keep your home office safety: wireless portable door sensor alarms offers a generous detection area of nearly 160 feet. You could hear doorbell chime as visitors or guests arrive to your home, store, office etc. It sounds to notify you someone enter into, or alert you intruder trying to entry your home. Or remind you when your Children Elderly or Dementia Patients open the door window and sneak around. Multiple melodies&Loud