Asus has accidentally listed several smartphones on its official website. One of the leaked smartphones that caught tech enthusiasts' attention is the Asus Zenfone 4 Pro. The device is rumored after it got listed on Asus' official website. Coincidentally, leakster Roland Quandt has also recently leaked the specs sheet of the upcoming Zenfone 4 Pro.

The Zenfone 4 Pro (ZS551KL) is the flagship of the lot. According to the leakster, the Zenfone 4 Pro might come with a large 5.5-inch AMOLED display with 1920 x 1080p resolution. The device is said to house top-of-the-line specs like Snapdragon 835 processor, 6GB of RAM and 64GB of onboard storage, Android Marvel reported. The upcoming ZenFone 4 Pro might be ASUS' high-end device for the ZenFone 4 lineup, and consumers may expect ASUS to use a Quad HD screen here.

The Asus ZoneFone 4 Pro is also expected to come equipped with 3,600mAh battery to keep the device going throughout the day. The device will also end up supporting expandable storage on top of the 64GB that is said to be available internally. Other specs of Zenfone 4 Pro are Bluetooth 4.2, NFC, Wi-Fi 802.11ac, and Android 7.1 Nougat for the software version, as well as a thickness of 7.6mm.

Software wise, ASUS had previously unintentionally leaked a few ASUS phones on its website, namely the ZenFone 4 Selfie, ZenFone 4 Selfie Pro, and the ZenFone 4 Max. All of the leaked devices were listed to come with Android 7.1 Nougat, so it's not surprising that ASUS may choose to keep the software standard across the entire lineup of devices, as reported by Android Headlines.

Regarding the price, it is still unclear on how much ASUS ZenFone 4 Pro will cost and when it will be released. Reports say that the ZenFone 4 is said to cost €399 in Europe, and even though these specs are listed for the U.S. model, the Pro version for Europe is sure to cost more than the standard version of the phone.