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OS Android 4.4.2 (KitKat), Lenovo Vibe UI 2.0, Power Saver & Zero Bloatware
Chipset MediaTek MT6582M (28 nm 1.3GHz Quad-Core 32-bit Cortex-A7 Processor with Mali-400 MP2 GPU @ 500MHz)
RAM 512MB RAM (Smooth multitasking for daily messaging & calls!)
Storage 4GB High-Speed Storage
Display 5.0 inches • 480 x 854 pixels (16:9, Compact 5.0" FWVGA 480p 16:9 IPS LCD Cinema Display, 196 ppi)
Main camera Pro Flagship 2.0 MP Rear Camera with LED flash & 480p Video: 2.0 MP (Fixed Focus, HDR, 480p@30fps video recording) with High-Power LED flash
Selfie camera Pro Flagship 0.3 MP Front Camera for Video Calling & 480p Video (0.3 MP VGA, 480p video)
Battery Monumental 2000 mAh Colossal Monster Battery! (Removable Li-Ion, swappable on the go! Powers over 15 hours continuous calling / 340 hours standby / 7 hours continuous video / 40 hours audio!), Micro-USB 2.0 charging in box + Power Saver • Removable Li-Ion 2000 mAh (swappable on the go!)
Weight 150 g (5.29 oz)

Latest Lenovo A399 user agents:

User Agent Browser Platform
Mozilla/5.0 (Linux; U; Android 4.4.2; uk-; Lenovo A399 Build/KOT49H) AppleWebKit/534.24 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.24 T5/2.0 bdbrowser/6.4.0.4 Baidu Browser 6 Android 4A399
Mozilla/5.0 (Linux; U; Android 4.4.2; en-US; Lenovo A399 Build/KOT49H) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/57.0.2987.108 UCBrowser/12.2.5.1102 Mobile Safari/537.36 UC Browser 12 Android 4A399
Mozilla/5.0 (Linux; Android 4.4.2; Lenovo A399) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.99 Mobile Safari/537.36 Chrome Mobile 80 Android 4A399
Mozilla/5.0 (Linux; Android 4.4.2; Lenovo A399 Build/KOT49H) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/30.0.0.0 Mobile Safari/537.36 MxBrowser/4.5.10.7000 Maxthon 4 Android 4A399
Mozilla/5.0 (Linux; Android 4.4.2; Lenovo A399 Build/KOT49H) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/30.0.0.0 Mobile Safari/537.36 MxBrowser/4.5.10.1300 Maxthon 4 Android 4A399
Mozilla/5.0 (Linux; Android 4.4.2; Lenovo A399 Build/KOT49H) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/30.0.0.0 Mobile Safari/537.36 GSA/4.2.16.87075793.arm Google Search App 4 Android 4A399
Mozilla/5.0 (Linux; Android 4.4.2; Lenovo A399 Build/KOT49H) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/30.0.0.0 Mobile Safari/537.36 bdbrowser_i18n/4.2.0.4 Baidu Browser 4 Android 4A399
Mozilla/5.0 (Linux; Android 4.4.2; Lenovo A399 Build/KOT49H) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/30.0.0.0 Mobile Safari/537.36 bdbrowser/6.4.0.4 Baidu Browser 6 Android 4A399
Mozilla/5.0 (Linux; Android 4.4.2; Lenovo A399 Build/KOT49H) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/30.0.0.0 Mobile Safari/537.36 Chrome Webview 30 Android 4A399
Mozilla/5.0 (Linux; Android 4.4.2; Lenovo A399 Build/KOT49H) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.109 Mobile Safari/537.36 Chrome Mobile 65 Android 4A399
Mozilla/5.0 (Linux; Android 10; Lenovo A399 Build/KOT49H) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/101.0.4951.54 Mobile Safari/537.36 Chrome Webview 101 Android 10A399