Products Show

ABS Standalone Access Control Keypad
mini Web Camera
Bluetooth Access Controller
WiFi Access Control Module
WiFi Access Controller
Electric RIM lock-Iron Nickle-Plated
Electric RIM lock-Iron Nickle-Plated
CISA Lock with Nickle
Fire and Alarm Linkage Expansion Panel
ADCT3000-1 Single-door access controller
Web Single Door Access Control Panel
Wireless Access Control Kits
Metal Facial Standalone Controller
Single Door 600lbs EM Lock
Shear Lock
5 wires Bolt Lock with Low Temp and Timer
Digital Cabinet Lock
Standard-type Electric Strike
CISA Lock with Nickle
Semiconductor Finger Glass Lock
Automatic Swing Door Opener
Face Thermal Temp. Monitoring
IP68 Fingerprint Control
Shear Lock
3A Switch Power Supply Controller
5M UHF Passive RFID Reader
Embedded ID iButton Reader
QR Code Wiegand Reader
Wireless Wiegand Reader
Touchless Sensor Exit Button
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Company Profile

S4A is a manufacturer for Electromagnetic locks, Access control, UHF RFID reader, biometric access control, etc in Shenzhen, China since 2006,Your business is a plant, we are the gardener, our mission is to water and fertilize the plant, and make it become the towering tree. S4A is established in 2006, we focus on manufacturer access control products for OEM&ODM and project solution....

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Service system


  • Complete customer feedback system
  • High-efficiency rapid response service team
  • Sound after-sales technical debugging guidance program
  • After-sales customer return visit and service file management
  • After-sales service system and customer complaint handling

News Center


What is Access Control?

In physical security, the term access control refers to the practice of restricting entrance to a property, a building, or a room to authorized persons. Physical access control can be achieved by a human (a guard, bouncer, or receptionist), through mechan…...

How does an Access Control System Operate?

When a credential (card, fob, fingerprint, etc.) is presented to a reader, the reader sends the credential’s information, usually a number, to a control panel / processor. The control panel compares the credential's number to an access control list, …...

Magnetic Locks Vs Electric Strikes

Magnetic locks and electric strikes are electrical hardware devices used to maintain the security of a door opening. Both of these devices can be activated by a range of tools, including passcodes, biometric readers, keycards or buzzers. When comparing ma…...

What is Electric Strike Lock?

S4A Electric Strike Lock is a device that's installed on a door to allow access with an access control system or some other type of remote release system. The electric strike, unlike a magnetic lock doesn't actually secure the door. A do…...

How does an Electromagnetic Lock Operate?

S4A Electromagnetic lock, Magnetic lock, or Maglock is a locking device that consists of an electromagnet and an armature plate. By attaching the electromagnet to the door frame and the armature plate to the door, a current passing through the electr…...

How does Magnetic Lock work?

ComponentsA magnetic lock, often referred to as a mag lock, consists of an electromagnet and an armature plate. The magnet is mounted inside of the door opening, which prevents tampering, while the plate is installed on the face of the door. When the magn…...

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