Since the launch of jm21, fiio have carefully listened to feedback from users around the world, and fully understands the request for larger storage and longer battery life. Therefore, the jm21 4g64g version is now here, offering more options for consumers in need. Entry level price with flagship chips an all new processor beyond the average ndash inside the jm21 is the qualcomm snapdragon 680, featuring 8 cores based in the kryotm 265 architecture, clock frequencies up to 2.4ghz, and made on the 6nm fabrication process. Experience a significant performance leap with noticeably reduced power consumption for a silky smooth experience. Powerful penetrating sound ndash 700mw power output a specially designed and tuned audio circuit allows the jm21 to achieve a balanced power output of up to 700mw700mw within an ultra thin body of only 113mm thickness. This ensures that it drives all kinds of headphones with ease. 3 gain levels ndash 3 volume curves the jm21 has 3 levels of low, medium and high gains, each gain level having its own volume curve. This allows the jm21 to give you a better listening experience with various types of headphones, whether you are using earphones or over ear headphones. Dual flagship cs43198 dac ndash fully balanced design two cirrus logic flagship cs43198 dacs are paired with two high performance sgm8262 op amps in a fully balanced audio design. Thanks to fiios experience with the development of numerous products, they have further optimised the segmented power supply as well as the front and rear stage gain for wider dynamic range and enriched musicality. Self developed daps digital audio purification system fiio jm21 features the brands self developed dapsdigital audio purification system design. This bypasses the android src degradation for the audio signal, so whether you use fiio music application or apple music or any other lossless media application, you will get full benefit of the premium audio circuitry of jm21 and experience top quality audio performance. It consists of 5th generation fpga architecture with dual independent crystal oscillators for pure signal processing across different applications. Say bye to battery anxiety ndash 16 hours of ultra long battery life the ultra long battery life, enough for continuous listening for an entire day, ensures you can listen pleasantly without worrying about running out of power.