Features:
【High Configuration】 Android 9.0 operating system, quad-core processor, stable and reliable, simple operation, strong compatibility. 2G+16G large memory, running multiple tasks at the same , still smooth and not stuck. Support NFC function.
【Built-in Barcode 】 1D/2D scanning engine, which can quickly scan and identify 1D/2D/QR barcode, high reflective barcode, frayed barcode, fuzzy barcode and screen barcode, for inventory, warehouse, logistics, retail, etc.
【Multiple Network Modes】 Support 4G, 3G, 2G, and network modes, and make business data interconnection more stable and efficient, free from geographical restrictions, enjoy high-quality network communication and data transmission and anywhere.
【Long Endurance & 】 Built-in 3750mAh Li-ion polymer , and low consumption processor, long , ensuring the smooth progress of the work. Made of ABS and PC materials, enabling the terminal and has long service .
【Ergonomic Design】Equipped with 4 inch color screen and full digital keyboard, realize the experience of large screen and hand operation. Newly designed ergonomic scanning angle can effectively reduce wrist movement and fatigue. 5 million rear with auto function, quickly identify the code
【Modular Design】Users can customize and expand according to their needs to meet the needs of various industries. Supports secondary development of software and hardware to meet user needs in an all-round way.

Specification:
Model: 3503M
Dimension : : 170x70x40mm(LxWxH)
Weight:  270g
Display: 4.0 inch IPS, 800*480
OS: Android 9.0
SDK: ZKC SDK
Development Language: JAVA
Touchscreen: Capacitive touchscreen 
Built-in non-removable Li-ion polymer ,3.7V, 3750mAh
: about 150 minutes
Standby : about 14 hours of continuous video playback
Port: Serial port, GPIO, I2C, USB Type-C, etc
slot: 1*SIM , 1*TF , Max 128GB
: 5V, 3A or quick  
and humidity: : -10℃~50℃, humidity: 0~95%
Audio: , speaker, mic,
Video: decode 1080p@30fps H.264/H.265; encode 1080p@30fps H.264 
CPU: MTK MT6739, ARM Cortex-A53 
CPU cores: Quad-core
CPU frequency: 1.3 Ghz
Memory: 2GB RAM, 16GB ROM 
Network: 4G (LTE-FDD B1/3/5/8,LTE-TDD B38/39/40/41 ), 3G(WCDMA B1/2/5/8, -SCDMA B34/39),2G(GSM B2/3/5/8 )
Barcode Module: 2D module
1D: UPC/EAN, UPC/EAN with supplementals, Code128, GS1-128, Code 39, Trioptic Code39, Code 32, Code 93 Code11, Matrix 2 of 5, Interleaved 2 of 5, IATA 2 of 5, 
Industrial 2 of 5, Codabar, CodablockF, MSI, Telepen, Code11, GS1 DataBar variants
2D: PDF417, MicroPDF417, Composite Code, Data Matrix, Maxicode, QR Code, MicroQR, Aztec
Rear : 5.0MP auto
Flashlight: Rear flashlight
Package Size: 215x108x75mm/8.4x4.2x2.9in
Package Weight: 500g/17.6oz

Packing List:
1 x Device
1 x USB Type-C Data Cable
1 x