Why choose the MA390 Universal?The MA390 Universal earbuds use our signature AerophonicTM shape to funnel sound to your ear without obstruction. Resulting in remarkable clarity and a secure, noise isolating fit when paired with our range of ear tips. Sound isolation is very important in earphones, especially for preserving bass frequencies which can get lost in ambient sound e.g. traffic or aeroplane noise.How does the universal remote work?Most earphone remotes use device specific chips, i.e. Android or Apple, to communicate with your mobile phone for volume control etc. Our remote uses one button to utilise the universal commands of most mobiles. Meaning you can control most devices using multiple click functions and digital assistants (Siri, Google Assistant, etc.) via the microphone.Who are RHA? Founded in Glasgow, RHA draws inspiration from the UK’s rich heritage of invention and engineering. Every component is engineered by our team to achieve the highest quality performance, using advanced techniques and premium materials.All of our headphones are backed by our industry leading 3 year warranty when purchased from RHA or Amazon directly.What’s in the box?MA390 Universal EarphonesMesh Carry CaseClothing Clip3x Silicone Dual Density Ear Tips (S/M/L)MA390 Universal User GuideTech specs.Frequency Response: 16 – 22,000 HzImpedance: 16 OhmsSensitivity: 89 dB