The best power banks in 2024, as tested by our experts
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Technology
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Caskeid adds MQA studio-quality audio streaming support
Media streamers SpeakersPure, Onyko and Meridian first in line for high quality wireless streaming with MQA
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Acer Revo One RL85 review - hands on with the 6TB mini PC
PC systemsThe Revo One RL85 may be tiny, but there's room for three 2TB hard disks inside Acer's latest micro PC
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Acer Chromebook 15 review - hands on
ChromebooksWe put the first 15in Chromebook through its paces here at CES 2015
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Acer H7550ST projector revealed with Chromecast internals
ProjectorsAcer says the H7550ST is the world's first to arrive with built-in support for Google's Chromecast dongle
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How to use the Excel Sumif formula
SoftwareAdding up the value of spreadsheet cells based on whether they match criteria using Sumif can really help you stay organised
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£10 inc VAT
Archos 50 Diamond smartphone and Helium 4G tablets revealed
Mobile phones TabletsArchos officially reveals its first 2015 smartphone and tablets ahead of CES
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How to use the Excel Countif formula
SoftwareWant to know how many records of a certain type you have in an Excel spreadsheet? You need Countif
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How to use Excel data validation
SoftwareKeeping an Excel spreadsheet with consistent values is easy thanks to Excel’s data validation feature
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Transcend ESD400K review
SSDs
A compact and good-value SSD, but we’re disappointed with its small-file transfer speeds
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£206 inc VAT