f you were to ask me the single most annoying issue I have with wireless earphones, or IEMs (In Ear Monitors if you prefer this acronym), it would be battery life. There is nothing more annoying than running out of juice, particularly if you’re kilometres away from anything resembling a power point. So for me the feature that would put Audio-Technica’s ATH-CKS50TWs at the top of my audition list would be that 20 hours claim for battery life, even though if you examine that claim more closely, it is
