Questyle Sigma Bluetooth Headphone Amplifier Portable Rechargeable DAC [MFi Certified] Bluetooth 5.4 Receiver with Dual Outputs High Resolution PCM768/DSD512 USB Amps for Smartphones/PC/Laptop

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• 【Portable Size Desktop Performance】：The Sigma was primarily designed to create a Hi-Fi system for smartphones and laptops, aiming to achieve performance comparable to top-tier desktop setups, within a portable size.
• 【MFi Certified】: SIGMA is officially MFi certified. This certification signifies flawless support for iPhone/iPad and Mac, meeting the stringent requirements for powerconsumption and compatibility of external devices, whileeliminating risks of damage from uncertified USB accessories.
• 【TTA Signal Processing Architecture】:To exceed customer expectations for decoding performance, SIGMA uses the highly acclaimed AK4493 DAC from AKM and is engineered with Questyle’s TTA architecture to deliver desktop-class audio performance.
• 【Patented Current Mode Amplifier Fully Discrete, Fully Balanced Architecture】: SIGMA incorporates four sets of patented, fully discrete, fully balanced CMA headphone/output amplifiers.Balancing size, power consumption, and sonic performance is the core challenge in portable audio devices.Questyle’s patented Current Mode Amplifier achieves both powerful drive capability and refined sonic character within a portable size.The fully discrete CMA delivers peak power up to >5W, peak current up to 3A, enabling exceptional dynamic drive capability.
• 【Comprehensive Compatibility with Mobile & PC】: SIGMA supports high-speed USB connections with smartphones and PCs, as well as lossless Bluetooth audio. Output modes can be switched between headphone amplifier and line-out for professional monitors or Hi-Fi systems.It can also enhance PC audio quality in settings like live concerts.It full compatibility with iOS, HarmonyOS, and Android 5.1+.For PC, it supports Windows 10 1803+ (driverless) and macOS.
• 【Certified by Qualcomm Snapdragon Sound and Sony LDAC】: SIGMA incorporates Qualcomm's latest-generation Snapdragon Sound technology (Bluetooth version 5.4) and is fully certified for both Snapdragon Sound and Sony LDAC.Snapdragon Sound utilizes leading Qualcomm aptX Adaptive technology, supporting aptX HD lossless audio, delivering CD-quality 16-bit 44.1kHz lossless and 24-bit 48kHz/96kHz high-resolution audio over Bluetooth to wireless earbuds and headphones.