Mitel 742d DECT Set - 51310677
The Mitel 742d DECT Set 51310677 is the hazardous-environment model in Mitel's 700d professional DECT handset family. Designed for industrial, manufacturing, petrochemical, pharmaceutical, utility, warehouse, and other demanding work environments, the 742d combines ATEX-certified protection, an IP65-rated rugged enclosure, personal-safety alarm functions, secure DECT communications, and Bluetooth connectivity in a mobile enterprise handset.
The 742d features a 2.4-inch color display, programmable keys, dedicated emergency button, man-down and no-movement sensing, Bluetooth 5.0 headset support, USB-C charging, hands-free calling, vibration alerting, a 920mAh rechargeable battery, and support for Mitel SIP-DECT messaging and alarm applications. This Set version includes the handset and desktop charging solution for deployment with compatible Mitel DECT infrastructure.
Key Features
- Mitel 742d professional DECT handset set
- Exact manufacturer part number 51310677
- ATEX-level model in Mitel 700d DECT family
- Designed for hazardous and industrial work environments
- ATEX Zone 1 and Zone 21 protection
- IP65-rated enclosure
- Rugged dust- and moisture-resistant construction
- 2.4-inch color display
- 240 × 320 pixel current published display specification
- 65,536-color display
- Illuminated keypad
- Programmable hotkey
- 3 programmable side keys
- Programmable softkeys and navigation controls
- Dedicated emergency / SOS key
- Man-down alarm support
- No-movement alarm support
- Escape alarm support
- Vibration alert
- Multi-function status LED
- Bluetooth 5.0
- Bluetooth headset support
- USB-C charging and data connection
- Optional microSD support for supported handset data
- Hands-free duplex speakerphone
- G.722 and G.726 voice codecs
- Local phone book for up to 200 entries
- Caller list for up to 50 entries
- Redial list for up to 30 entries
- 920mAh rechargeable Li-Ion battery
- Secure DECT communications
- DECT encryption and authentication support
- DECT XQ technology for improved operation in challenging RF environments
Applications & Use Cases
- Hazardous industrial work environments
- Petrochemical facilities
- Oil and gas environments
- Pharmaceutical facilities
- Manufacturing plants
- Utility and infrastructure operations
- Warehouses and logistics facilities
- Industrial maintenance teams
- Lone-worker applications
- Worker-safety and emergency communications
- Locations requiring man-down monitoring
- Locations requiring no-movement alarms
- High-noise operational environments
- Mobile employees requiring enterprise DECT coverage
- Multi-cell Mitel SIP-DECT deployments
Technical Specifications
Product
- Model: Mitel 742d
- Manufacturer Part Number: 51310677
- Product Type: Professional DECT Handset Set
- Series: Mitel 700d DECT Series
- Model Position: ATEX / Hazardous-Environment Handset
- Wireless Technology: DECT
- Compatible Infrastructure: Mitel SIP-DECT / Compatible Mitel DECT Systems
Display & Controls
- Display: 2.4-Inch Color TFT / IPS Display
- Current Published Resolution: 240 × 320 Pixels
- Color Depth: 65,536 Colors
- Keypad: Illuminated
- Hotkey: 1 Programmable
- Side Keys: 3 Programmable
- Softkeys: Programmable
- Navigation Keys: Programmable Functions Supported
- Emergency Key: Dedicated SOS / Alarm Key
- Status Indicator: Multi-Function LED
DECT Radio
- North American DECT Frequency: 1920-1930 MHz
- EMEA DECT Frequency: 1880-1900 MHz
- Modulation: GFSK
- Channel Spacing: 1.728 MHz
- Antenna: Integrated
- DECT Encryption: Supported
- DECT Authentication: Supported
- DECT XQ: Supported
Bluetooth & Connectivity
- Bluetooth: Bluetooth 5.0
- Bluetooth Spectrum: 2.4000-2.4835 GHz
- Bluetooth Class: Class 2
- Bluetooth Headsets: Supported
- USB: USB-C
- USB Functions: Charging, Configuration and Supported Data Transfer
- Optional Storage: microSD Interface
Audio
- Speakerphone: Duplex Hands-Free
- Voice Codecs: G.722, G.726
- Maximum Ring Level: Approximately 88 dBA SPL at 10 cm
- Earpiece Volume: Adjustable
- Headset: Bluetooth Headset Support
Safety & Alarm Functions
- ATEX: Hazardous-Environment Certified Model
- Hazardous Areas: Zone 1 and Zone 21
- Emergency / Alarm Button: Yes
- Man-Down Detection: Supported
- No-Movement Alarm: Supported
- Escape Alarm: Supported
- Vibration Alert: Supported
- Messaging / Alarm Applications: Supported with Compatible Mitel SIP-DECT Configuration
Battery & Charging
- Battery Type: Rechargeable Li-Ion
- Battery Voltage: 3.7V
- Battery Capacity: 920mAh
- North American Talk Time: Up to Approximately 15 Hours
- North American Standby Time: Up to Approximately 105 Hours
- Other-Region Talk Time: Up to Approximately 12 Hours
- Other-Region Standby Time: Up to Approximately 110 Hours
- Desktop Charger Full Charge: Approximately 2.5 Hours from Empty
- USB Full Charge: Approximately 5 Hours from Empty
Directory & Call Lists
- Local Phone Book: Up to 200 Entries
- Caller List: Up to 50 Entries
- Redial List: Up to 30 Entries
- Central Directory: Supported with Compatible System Configuration
- Messaging: Supported with Compatible SIP-DECT Applications
Ruggedness & Environment
- Ingress Protection: IP65
- Operating Temperature: -5°C to +45°C
- Storage Temperature: -20°C to +60°C
- Charging Temperature: +5°C to +40°C
- Drop Resistance: Ruggedized for Demanding Professional Use
- Color: Black
Physical
- Dimensions: 152 × 62 × 25 mm / Approximately 6.0 × 2.4 × 1.0 in, Excluding Clip
- Weight: Approximately 190 g / 6.7 oz for EX Configuration
- Construction: Ruggedized Handheld DECT Enclosure
Package Includes
- Mitel 742d DECT Handset
- Rechargeable 920mAh Li-Ion Battery
- Desktop Charging Cradle
- Charger Power Supply
Compatibility & Buying Information
Exact Set: This page is for Mitel part number 51310677, the complete 742d DECT Set. Mitel separately lists part number 51310673 as the handset-only version and part number 51310678 as the 7x2d Series desktop charger.
Requires DECT Infrastructure: The 742d is a DECT system handset and does not function as a standalone cordless telephone. It must be registered to compatible Mitel DECT / SIP-DECT infrastructure with supported base stations.
ATEX Model: The 742d is the hazardous-environment handset in Mitel's 700d family. Customers purchasing specifically for regulated or explosive-risk locations should verify the exact required ATEX classification, regional certification, facility requirements, and accessory restrictions before deployment.
Zone 1 and Zone 21: Mitel's current 700d product information identifies the 742d for ATEX Zone 1 and Zone 21 environments, expanding on the existing NTS page wording that currently mentions only Zone 1.
IP65 Protection: The enclosure is rated IP65 for demanding environments where protection against dust and water ingress is required.
Personal-Safety Functions: Integrated sensors support man-down, no-movement, and escape alarms. A dedicated emergency key can be used with compatible Mitel alarm and messaging applications.
Alarm Functions Depend on System Configuration: Personal-safety alarms, location functions, priority messaging, and interactive notification behavior require compatible Mitel infrastructure and appropriate system configuration. The handset alone does not provide a complete personnel-safety monitoring system.
Bluetooth Headsets: The 742d supports compatible Bluetooth headsets. For hazardous-area use, only accessories and operating configurations approved for the required environment should be used.
USB-C: The USB-C interface supports charging and supported configuration or data-transfer functions. Charging through USB is slower than using the desktop charging cradle.
Battery Runtime: Mitel's current user documentation lists up to approximately 15 hours of talk time and 105 hours standby for North American operation. Bluetooth use, alarms, vibration, display illumination, radio conditions, and other functions can reduce actual runtime.
Set vs. Handset Only: Part 51310677 is the Set version and includes the charging solution. Customers who already have compatible 700d charging equipment may instead encounter the separate handset-only part number 51310673.
Best Fit: Mitel 742d 51310677 is best suited to mobile employees in hazardous, rugged, or safety-sensitive environments that require enterprise DECT communications, worker-safety alarms, Bluetooth connectivity, IP65 protection, and ATEX-certified handset operation.