For the second time this month, a previously unknown Huawei handset has passed through certification by the Federal Communications Commission with the most recent bearing the model designation LDN-LX3. As is usually the case with FCC filings, there aren't many specifications or other details provided from the certification - which is filed under FCC number QISLDN-LX3. Bearing that in mind, it isn't likely that this device will turn out to be one of the company's high-end models, such as the highly anticipated P20, based solely on the battery specs. Beyond that, there isn't much here to give away what Huawei device this is or even if it is one of the company's previously announced smartphones.
As to what can be ascertained from the FCC's test results, it is known which network frequency bands will be supported and that those include compatibility for networks in the U.S. More directly, bands supported by the device include GSM bands in the 850 MHz, 900 MHz, 1800 MHz, and 1900 MHz range. For UMTS, bands B1, B2, B4, B5, and B8 are all supported, while 4G LTE is supported on bands B2, B4, B5, B7, and B28. Continuing on the connectivity front, the FCC's testing shows that this device will offer users the ability to connect to other devices via low-energy Bluetooth 4.2. Meanwhile, the battery found in the LDN-LX3 is listed as a 2,900mAh battery, which is charged via an adapter set at an output of 5V/1A. That doesn't necessarily provide much insight into how charging will work with this device, but the battery is on the small side and those charging numbers don't seem to indicate the inclusion of any kind of fast-charging capability.
Last but not least, the device does appear to have support for a microSD card for storage expansion, though it isn't clear how much additional storage can be added or how much Huawei has decided to ship on the device by default. Happily enough, the mysteries surrounding this handset may be revealed soon enough, since Huawei is set to hold a press conference in late March for several handsets. With consideration for the timing of this certification, this device may be among those. Having said that, the company may opt to wait for a separate announcement, so that should be taken with a grain of salt.