The Oppo A3 is a mid-range smartphone that was released in May 2018. 
Below are its key details,


Price

Launch Price: Approximately $300 (price varies by region).

Current Price: As the model is older, it may be available at a 
lower price in some markets, or only available second-hand.


Key Features & Specifications

Design and Display

• Screen: 6.2-inch LTPS IPS LCD, 1080 x 2280 pixels (Full HD+), 
  19:9 aspect ratio.

• Build: Plastic body with a glass front.

• Notch: Yes, small notch for the front camera.

• Processor: MediaTek Helio P60 (12nm).

• CPU: Octa-core (4x2.0 GHz Cortex-A73 & 4x2.0 GHz Cortex-A53).

• GPU: Mali-G72 MP3.

• Operating System: ColorOS 5.0 based on Android 8.1 (Oreo).

• Memory: RAM: 4 GB.

• Storage: 128 GB, expandable via microSD card (up to 256 GB).

Camera

Rear Camera: Single 16 MP, f/1.8, PDAF.

Features: HDR, panorama, LED flash. Video: 1080p@30fps.

Front Camera: 8 MP, f/2.2.


Battery

Capacity: 3,400 mAh (non-removable).

Charging: Standard charging (no fast charging support).




Connectivity

SIM: Dual SIM (Nano-SIM, dual standby).

Network: 4G LTE, 3G, 2G.

Ports: microUSB 2.0, 3.5mm headphone jack.

Others: Wi-Fi, Bluetooth 4.2, GPS, FM radio.

 

Sensors

Accelerometer, proximity, compass (no fingerprint sensor).