SA HAL™ ETU V2 Processor Unit - Rear Wiring

HAL™ ETU V2 processor unit – sensitive switching, modern features, longer lifespan

Looking for a way to significantly improve trigger response, increase the reliability of your AEG rifle, and protect internal components from unnecessary wear? Want a unit that safely switches the motor, provides active brake, offers pre-cocking as well as binary mode, and can safely work with Li-Po batteries without risk of damage? Need a system that is easy to program and offers many customization options? Then the Specna Arms HAL™ ETU V2 is the right solution. Thanks to the Hall effect, it detects trigger pull with high precision, greatly improving responsiveness and shot consistency. The unit provides advanced protection against low voltage, overload and incorrect activation, and is compatible with modern brushless motors (e.g., Warhead or Specna Arms Dark Matter). Installation of the included trigger is required for proper function.

User guide for the HAL™ ETU unit

Key Features

• Hall-effect trigger sensing:
  Maximum sensitivity, stability and zero wear thanks to magnetic detection.
  
  
• Active brake:
  Instant motor stop for better cadence and consistent shots.
  
  
• Binary trigger:
  Fires on pull and release — ideal for CQB shooting.
  
  
• Adjustable trigger sensitivity:
  5 levels from 20 to 100%.
  
  
• Pre-cocking:
  6 levels for instant shot reaction after trigger pull.
  
  
• Programmable firing modes:
  SEMI (semi, binary, AUG, sniper), AUTO (auto, 3-round burst, 5-round burst).
  
  
• Easy programming:
  All settings controlled directly via the trigger — no apps or cables.
  
  
• System protections:
  Low voltage, overvoltage, overload above 40 RPS, extended component lifespan.
  
  
• Compatibility with BLDC motors:
  Fully prepared for modern brushless motors.

Important Notice

• In AUTO mode, the rifle will first fire a 3-round burst before switching to full-auto.
• The included updated trigger must be installed for correct function.

Unit Activation After Installation

• Switch the fire selector to SAFE.
• Connect the battery and wait for the first beep (approx. 3 s).
• Hold the trigger for 5 seconds until the second beep.
• The unit is now active and ready to use.

Technical Specifications

• Designed for: Gearbox V2
• Wiring: Rear
• Plug: T-Dean (male)
• Trigger detection: Magnetic sensors (Hall effect)
• Weight: 24.5 g
• Trigger sensitivity: 5 levels (20–100%)
• Pre-cocking: 6 levels
• Firing modes: Semi/Binary/AUG/Sniper, Auto/3-burst/5-burst
• Protections: Low voltage, overvoltage, RPS limit 40+

Package Contents

• HAL™ ETU V2 processor unit
• HAL™ trigger
• Insulation sleeves and spacer set
• V2 selector plate
• Programming card