The handset has an Accelerator sensor, an E-Compass, a Proximity Sensor, an Ambient light sensor, a Gyro (Support ARCore), and a Hall sensor. It charges over a USB Type-C port, supports Quick Charge 4.0, and USB Power Delivery 3.0. The device packs a 4,300 mAh battery that can be charged from 0 to 50% in 30 minutes, using the 30W Hypercharge Adapter. The ASUS Zenfone 9 retains the 3.5mm headphone jack, has Dual Stereo Speakers, Qualcomm WSA8835 smart amplifiers, 2 microphones with OZO Audio Noise Reduction Technology, and supports Dirac HD Sound. The cameras support 8K UHD video recording at 24 fps, 4K 60FPS, and 1080p 60FPS. The main camera array on the rear consists of 2 large sensors, with a 50 megapixels Sony IMX 766 sensor, with an f/1.9 aperture, a 6-axis hybrid gimbal stabilizer, and a 12MP Sony IMX 363 113° FOV Ultra-wide angle lens with an f/2.2 aperture, and supports 4cm Macro Shot, LED Flash. The handset has 8GB/16GB of LPDDR5 RAM, and 128GB/256GB of UFS 3.1 storage. The ASUS Zenfone 9 is powered by an octa-core Qualcomm Snapdragon 8+ Gen 1 processor, with an Adreno 730 GPU, and has a Vapor Chamber Cooling System.

The selfie lens on the front is a 12 megapixels Sony IMX 663 sensor with an f/2.45 aperture, and supports 4K video recording and The display is protected by Corning Gorilla Glass Victus. The screen supports a Full HD+ resolution of 2400 x 1080 pixels, 120Hz Refresh Rate, has a 112% DCI-P3 Colour Gamut, a maximum of 1100 nits brightness, a pixel density of 445 PPI, a 20:9 Aspect Ratio, Always-On Display, HDR10 and HDR10+, and a Delta-E < 1 Colour Accuracy. The smartphone has a 5.9-inches Super AMOLED display made by Samsung. The key also has a side-mounted fingerprint scanner, and functions as a programmable button. The 5G flagship phone has a ZenTouch scroll key in the power button.

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