★ Smart-K BOX Speaker, 6.56-inch 90Hz Smart Display: With a large 6.56-inch screen and a solid, calm look, the intrepid BV4800 SE boasts an 83% screen-to-body ratio for excellent picture presentation. It offers a larger screen and more comfortable visual effects for your eyes. Feel every beat and every note with BV4800 SE's Smart-K BOX speaker, taking your audio enjoyment to unparalleled heights with its powerful sound.★ Enduring at Its Core, 5100mAh Large Battery: The 5100mAh battery in the BV4800 SE extends your joy throughout the day and beyond. The high-capacity battery reliably meets your productivity needs, whether for work or study, without frequently requiring a recharge. (816 hrs Standby, 24 hrs Calling, 7.5 hrs Video, 5W Reverse Charging Support)★ Record Richer Details, 8MP + 16MP + 2MP Cameras: Whether in bright or low light, the 8MP front camera ensures clear, vibrant selfies that capture every detail of your expressions. With the 16MP and 2MP rear cameras, all your unforgettable moments and stunning views are preserved in high resolution, so you can relive them anytime.(1080P Video Recording, underwater camera)★ Up to 12GB RAM, =4GB RAM+ Up to 8GB RAM Expansion, 64GB ROM + Up to 2TB TF Card Expansion: BV4800SE has 4GB of RAM coupled with 8GB of virtual RAM, allows you to switch back and forth smoothly between multiple applications.On top of the 64GB ROM memory, BV4800 SE can also be equipped with up to a 2TB TF card to store diverse applications, colorful photos, and brilliant clips.★ Submerge Without Fear, Advanced IP68 & IP69K Rated Waterproofness: With advanced IP68 and IP69K waterproof ratings, BV4800 SE offers complete protection against water ingress and remains undamaged, even when immersed in water under pressure, demonstrating its durability and ruggedness.(Glove-Friendly Screen, Top-tier MIL-STD-810H Military Standard)