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Microsoft Lumia 540 Dual SIM

Front camera: 5MP wide angle
Camera Flash Type: Led flash
Processor type: Quad-core 1.2GHz
Maximum talk time (3G): 14.8 h
Maximum standby time with dual SIM: 24 days
Free OneDrive storage built in up to: 30 GB
Software release: Windows Phone 8.1 with Lumia Denim 
Display size: 5 ''
RAM: 1 GB 
User data storage: In device, Memory card, OneDrive cloud storage, App and data storage on memory card
CPU name: Qualcomm® Snapdragon™ 200
Number of cores: Quad core
Clock rate: 1200 MHz
Sensors: Ambient Light Sensor, Accelerometer, Proximity Sensor
Wi-Fi hotspot: Up to 8 Wi-Fi-enabled devices
Location technologies: A-GLONASS, A-GPS, Cellular and Wi-Fi network positioning

Messaging features:
Text messaging, Automatic resizing of images for MMS, Distribution lists for messaging, Multimedia messaging, Conversational chat style SMS, Unified inbox for SMS and MMS, Concatenated SMS for long messages, Integrated text messaging and chat, Number screening for messaging, Text-to-speech message reader

Download the device manual from here