The HP EliteBook 840 G1 is a business-class laptop known for its reliability, performance, and security features. Here are the detailed specifications:

Processor

• Model: Intel Core i5
• Generation: 4th Generation (Haswell)
• Speed: Typically around 1.9 GHz to 2.6 GHz (varies by specific model)
• Cores: Dual-core

Memory

• RAM: 8 GB DDR3L (upgradable up to 16 GB)

Storage

• Hard Drive: 500 GB HDD (can be upgraded to SSD for better performance)

Display

• Size: 14 inches
• Resolution: 1366 x 768 pixels (HD) or 1600 x 900 pixels (HD+), depending on the model
• Type: Anti-glare LED-backlit

Graphics

• Integrated: Intel HD Graphics 4400

Connectivity

• Wi-Fi: Intel Dual Band Wireless-AC 7260 802.11ac
• Bluetooth: 4.0
• Ethernet: Yes, Gigabit Ethernet

Ports

• USB: 4 x USB 3.0 (one with charging)
• VGA: 1 x VGA port
• DisplayPort: 1 x DisplayPort 1.2
• Audio: Combo headphone/microphone jack
• Docking connector: Yes
• RJ-45 (Ethernet): Yes
• SD card reader: Yes

Input Devices

• Keyboard: Spill-resistant, backlit (optional)
• Pointing Device: Touchpad with on/off button, two-way scroll, gestures, two buttons; Pointstick with two additional pointstick buttons

Audio

• Speakers: Stereo speakers
• Microphone: Integrated dual-microphone array

Battery

• Type: 3-cell, 50 WHr Li-ion
• Battery Life: Up to 12 hours (varies based on usage and configuration)

Dimensions and Weight

• Dimensions: 13.34 x 9.33 x 0.83 inches (33.88 x 23.7 x 2.1 cm)
• Weight: Starting at 3.48 lbs (1.58 kg)

Operating System

• OS: Windows 7 Professional (64-bit) or Windows 8.1 Pro (64-bit); upgradable to Windows 10

Additional Features

• Security: HP BIOSphere with Sure Start, HP Client Security, HP Fingerprint Sensor (optional), TPM 1.2 Embedded Security Chip
• Webcam: 720p HD webcam (optional)
• Durability: MIL-STD 810G tested for durability.

The HP EliteBook 840 G1 is a robust laptop designed for business users, offering good performance, durability, and a range of security features. With its 4th generation Intel Core i5 processor, 8 GB of RAM, and 500 GB HDD, it can handle everyday office tasks efficiently. Upgrading to an SSD can significantly improve its performance and responsiveness.