It is recommended to use a 7.4V battery for this replica.
The ARCTURUS AK-12 PE electric airsoft pistol is the latest version with an integrated PERUN v3 optical ETU, compatible with 2-burst mode, a receiver, trigger, gas tube, stamped steel front and rear sights, and more. It features a spring-loaded quick-load gearbox, 8mm steel magazine, and a microswitch trigger.

Specifications

Construction Material: Steel / Aluminum / Polymer
Gearbox: Version 3
Magazine Capacity: 30 / 130 rounds (6mm bullets)
Overall Length: 700 mm
Barrel Inner Length: 425 mm
Weight: 3,480 grams
System: Electric gearbox
Battery Type: 8.4V stick / 7.4V (not included)
Hoop: Adjustable
Package Includes: Magazine for AK12, AEG, and manuals.

ARCTURUS AEG PE™ - PERUN X OPTICAL MOSFET ETU ARCTURUS V3 PE

Electronic Fuze
AK12 Ready with 2-Burst Mode
Adjustable Trigger Sensitivity (5 Levels)
Adjustable Pre-Cock (8 Levels)
Binary Trigger
Firing Mode Adjustment
ROF (Rate of Fire) Reduction
Li-Po Alarm
Diagnostic System
ARCTURUS RS™, Reinforced Polymer Precision Rotary Gun Hop-Up Unit
ARCTURUS RS™ High-Torque Motor with MIM Steel Pinion
ARCTURUS RS™ 13:1 CNC-Machined Steel Gearset
ARCTURUS V3 Adjustable Trigger Stop * Features for ARCTURUS V3 PE

https://www.arcturus-tactical.com/download/AT-AK12-PE_Manual.pdf