Product Name: Patient Nurse Call System Construction Hoist Call Alarm System Condition: New Certification: CE, ISO Frequency: 3 Kinds Quantity: Depends on Floors Trademark: STRONG Transport Package: Carton Box Specification: the phone is 200*120*50mm Origin: Shanghai HS Code: 84313900 Product Description FAQExplainCommunication FailureThe protective ground wire of the coupler is grounded in the middle ground, and the protective earth wire and the ground wire in the hanging basket are not connected.Poor communicationHigh resistance caused by ground wiring and/or poor connection.Interference caused by electric motorCables require better sheielding.