Experience premium electrostatic sound in a compact, ear-canal design with the SR-003MKII. This 5-pin PRO bias in-the-ear earspeaker delivers exceptional audio clarity across the full 20-20 kHz spectrum with a push-pull electrostatic driver. The redesigned canal-type structure provides comfort without ear coverage, while three silicone ear piece sizes ensure a secure fit. Weighing just 12g, it connects seamlessly to any STAX driver unit or adapter with PRO bias output. The 1.5m cord and 550-580V bias voltage specification make this an ideal choice for audiophiles seeking portable, high-fidelity electrostatic performance. The SRM-D10 II represents STAX's latest advancement in portable electrostatic amplification and high-resolution audio processing. This compact yet powerful amp/DAC combines a premium power amplifier with integrated high-resolution decoding, supporting DSD256 and PCM up to 384kHz/32bit for faithful reproduction of studio-quality recordings. The robust 580V DC bias output unlocks the full potential of all STAX PRO-type headphones with dynamic, detailed soundstage performance. Dual connectivity via USB Type-C and 3.5mm analog inputs provides seamless integration with modern devices, while the aluminum alloy construction ensures durability. With approximately 4.5 hours of battery life on analog input, the SRM-D10 II delivers professional-grade electrostatic sound in a truly portable package.