What should I do if communication fails?

Check if the protective ground wire of the coupler is grounded in the middle ground; ensure the protective earth wire and ground wire in the hanging basket are connected properly.

Is the intercom suitable for extreme weather?

Yes, the system is designed to operate in extreme weather conditions and features a heavy-duty composite Nylon Plastic enclosure.

What is the minimum order quantity?

The Minimum Order Quantity is 1 Pc.

Audio Handset 2 Wires Audio Intercoms

Name: Audio Handset 2 Wires Audio Intercoms
Brand: Shanghai Strong Engineering Construction Co., Ltd.
SKU: 851190025

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.

IS-3F (Intercom system 3 frequency)

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: Recommended by OSHA as the industry standard for construction hoist safety in USA, Canada, and Australia.

Crystal Clear Communication: Provides clear voice transmission to enhance productivity and reduce liability risks in emergency situations.

No RF License Required: Uses protection loop line signal transmission without electromagnetic pollution, avoiding the need for radio frequency application.

Emergency Alarm Function: Equipped with emergency alarm switches on all units to ensure immediate contact during worker injuries or heart attacks.

Customizable Frequency: Supports 3 kinds of frequency channels (250KHz, 741KHz, 800KHz) to prevent interference in dense construction areas.

Safe 24V DC Operation: Powered by safe 24 volts DC with backup battery supply, ensuring reliable operation in extreme weather conditions.

Durable Nylon Enclosure: Constructed with heavy-duty composite Nylon Plastic enclosure for long-lasting performance in industrial environments.

Easy Installation: No antenna wire required; units are interchangeable and designed for straightforward installation on elevator floors and cages.

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 are the main applications of this intercom?

It is mainly used on construction and temporary hoists/elevators to provide emergency calls between floors and the elevator driver, improving safety and productivity.

Q:Does this system require a radio frequency license?

No, the signal transmission uses a protection loop line with no electromagnetic wave pollution, so you do not need to apply for a radio frequency license.

Q:What is the effective range of the intercom?

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

Q:What power supply does the system use?

The system is powered by safe 24 volts DC, with a supply voltage of 220V AC or 110V AC for the special power supply device.

Q:What frequencies are available for this intercom?

Three frequencies are available: 250KHz, 741KHz, or 800KHz, allowing selection to prevent interference in dense construction areas.