Product Name: Intercom System of Emergency Call for Construction Hoist Model NO.: HC2.0 Condition: New Certification: CE, ISO Information content: Voice Type: Wired Usage: Mckee Frequency: 3 Kinds Quantity: Depends on Floors Effective Range: More Than 300m 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.