Does the system require a radio frequency license?

No, the system uses a protection loop line for signal transmission and does not require a radio frequency license.

What is the power supply requirement?

The system operates on safe 24 volts DC and can be powered by 220V AC or 110V AC.

Can the units be used interchangeably?

Yes, all units in the system are interchangeable and do not require antenna wires.

Construction Security Emergency Interphone Voice Doorphone Intercom System

Name: Construction Security Emergency Interphone Voice Doorphone Intercom System
Brand: Shanghai Strong Engineering Construction Co., Ltd.
SKU: 702328751

Shanghai, ChinaShanghai Strong Engineering Construction Co., Ltd.

US$198.00-228.00

1 Piece

Sample price:US$1.00/piece.Request sample

Product profile

Customization

Available

Usage

Telephone

Type

Wired

Model NO.

HC2.0

Information content

Voice

Certification

CE, ISO

Condition

New

Frequency

3 Kinds

Quantity

Depends on Floors

Transport Package

Carton Box

Specification

the phone is 200*120*50mm

Trademark

STRONG

Origin

Shanghai

HS Code

84313900

Production Capacity

30000 Pieces/Year

Key features

OSHA Recommended Safety: Industry standard for construction hoists, recommended by OSHA for emergency communication.

Crystal Clear Voice: Designed for clear two-way communication to ensure worker safety and reduce response time.

Three Frequency Options: Available in 250KHz, 741KHz, or 800KHz to prevent interference in elevator-intensive areas.

No Radio Frequency License: Uses protection loop line transmission, eliminating need for RF application or antenna wires.

Emergency Alarm Function: Features dedicated alarm switches on all units for immediate emergency contact.

Weather Resistant Design: Heavy-duty composite Nylon Plastic enclosure operates reliably in extreme weather conditions.

Safe 24V DC Operation: Powered by safe 24 volts DC with backup battery supply for the car unit.

CE and ISO Certified: Meets international safety standards with CE and ISO certifications.

Company profile

Importers and ExportersYears of Export ExperienceSelf-brandedExhibition Experience

Shanghai Strong Engineering Construction Co., Ltd.

Shanghai, China

CertifiedBusiness Type: Trading Company CertifiedCustomization Options: Customization from Samples, Customization from Designs CertifiedExport Year: 10 Years CertifiedNearest Port: Shanghai PortAverage Response Time: ≤15h CertifiedTerms of Payment: LC, T/T, D/P, etc.

AI-Powered supplier vetting

SummaryShanghai Strong Engineering Construction Co., Ltd. is a China-based trading company established in 2014, focused on lift accessories and related construction machinery, mechanical, electrical, and hardware products. The supplier reports five employees, overseas service limitations, no overseas warehouse, showroom, agent, or branch, and participation in bauma China. It offers customization from samples and designs but does not provide private mold development, 3D software design, ODM, OEM for popular brands, or SDK support. Product information indicates new products were developed during the past year. Service procedures and corrective-action records are documented, although the approved supplier list lacks signatures or dates. Audit information identifies TÜV Rheinland, but the evaluation result is recorded as 0 and the stated report validity ended on 2025-08-12. Production capacity, financial credibility, and customer case evidence remain insufficient for firm conclusions.

Supplier typeThe supplier is identified consistently as a trading company and limited company, with no larger-company group affiliation. Its stated scope covers lift accessories and a broad range of construction machinery, mechanical, electrical, metal, hardware, rubber and plastic, and automobile-related products.

After-Sales capabilityThe supplier reports written procedures and records for service-capability assessment, a corrective and preventive action mechanism, and ten qualified service-capability suppliers. It lacks overseas warehouses, showrooms, agents, and branches, although it has participated in bauma China and reports lead times within 15 workdays.

R&D capabilityThe supplier reports having launched new products during the past year, indicating some product-development activity. However, it does not offer ODM, private mold development, professional technical-supplier R&D, 3D software design, or SDK support.

Customization capabilityThe supplier explicitly offers customization from samples and designs. However, it does not provide private mold development or 3D software design services, so customization appears available in defined forms rather than as a full design-and-development service.

Product Q&A

Q:What is the effective range of the intercom system?

The effective range is more than 300 meters, provided the conductor loop resistance is less than 600 ohms.

Q:Why might communication fail?

Communication failure can occur if the protective ground wire is grounded in the middle ground or if the ground wire in the hanging basket is not connected properly.

Q:What causes poor communication or interference?

Poor communication is often caused by high resistance from ground wiring, poor connections, or interference from electric motors requiring better cable shielding.

Q:How many frequency channels are available?

The system offers three multiple frequency channels: 250KHz, 741KHz, or 800KHz.

Q:Is the system suitable for extreme weather?

Yes, the heavy-duty composite Nylon Plastic enclosure allows the system to operate in extreme weather conditions.