1、[Excellent Parts] Bionic diaphragm moving coil and 9 layer nano piezoelectric ceramic one piece unit and single custom moving iron, can truly reproduce the original sound details, sound can bring you low frequency, swoop powerful, fast bounce, clear mid range vocals, loud field, high frequency without harsh, more extended. 2、[HiFi] Pure aluminum materials are designed for accuracy, so our HiFi monitor earbuds can perfectly reproduce mid and HiFi sound. They produce a tighter, warmer and clearer sound that delivers subtle highs and smoother lows. 3、[Detachable Cord] The optional 0.78mm 2 pin plug detachable cord with four strands of single gold copper wire can be used with other detachable cord headphones. It can be easily connected to almost any jack and is tangled and durable for enhanced security and ergonomics. 4、[Gold Plated Design] Gold plated interface and aluminum cavity are CNC machined to replace Bluetooth cables for run wire, improved sound texture and detail, powerful magnetic dynamics and ultra thin diaphragm, high performance driver accuracy matched to within 1dB. 5、[Size Selectable] The headphones come with 12 sets of soft silicone ear tips to ensure your ear canal is comfortable. Designed for balance, bass enhancement or vocal enhancement sound characteristics, they also include memory foam ear plugs. Each earbud is available in 3 sizes for your choice.