This is Tachyon V4

A computer system for your Airsoft weapon

Built-in 550 mAh Battery for minimum 6-hour nonstop runtime (full brightness & screensaver disabled)
Micro USB charging
TachyonLink companion application: create custom graphics packs, get firmware updates and more through USB
Redesigned shape and dimensions
New addons
Electronic power switch - no more slide switches. Simply turn the device on with a single button press
Other minor software and hardware improvements

Displays both number and visual bar with configurable style and behaviour

6 quick-change presets of 0-9999 rounds

Color changes at 2/3 and 1/3 of ammo percentage

Can count down or up

Shots detected using an infrared barrel sensor, mechanical shocks, or both combined for misfire detection

Displays your current magnetic heading

3 Modes: Bearing (Azimuth), 8 Cardinal directions (N,NE,...), 16 Cardinal directions (N,NNE,NE,...)

Critical for proper navigation and tactical awareness

Fully 3D with automatic ground reference - works under any angle and orientation

Alerts you when your weapon is tilted sideways too much

Helps you fire BBs with optimal, straight-upwards spin and maintain best range and accuracy

Configurable (1-10 degrees) tilt threshold angle

Shows the current time in 24hr format

Helps keep track of important game events

Accurately measure the fire rate (RPM) of your weapon

More than 30 different settings ranging from UI colors, styles, behaviour or feature configuration

Save your settings into 4 different profiles to quickly switch between

Quick-change display brightness with configurable screen saver

Rotate the screen picture by 90 degrees for side mounting

Connects your Tachyon to your PC via USB

Create and upload custom graphics

Simple and easy firmware updates

Backup or copy device settings

Tachyon V4 has 3 modes of operation:

Infrared detection - Fired BBs are detected using an IR barrel-mounted sensor. Most accurate with best results, but the external sensor must be attached, replacing any potential barrel attachments.
Shock detection - Shots are detected through mechanical shocks by an on-board contact microphone. No external sensor is needed, but functionality is slightly limited. See Sound detection for more information.
Combined mode - Shots are detected using both methods at once, which enables misfire detection. When a shot is detected through shock, but no out-going BB is detected by the sensor, a warning is displayed.

Setup is easy and simple. All you need to do, is to attach the barrel sensor (if used), and the Tachyon computer to your weapon.

If you have more questions, please see our FAQ

TachyonLink All downloads

Mounting:	Picatinny (RIS/RAS) Rail, 21-22 mm
Enclosure dimensions (WxLxH):	37x90x26.5 mm = 1.46x3.54x1.05 in
Sensor mounting diameter:	14±2 mm (no thread required)

Charging:	Micro-USB
Battery:	550 mAh LiPo 3.7 V cell
Runtime:	Minimum 6 hours, up to 12 hours (with screensaver / low screen brightness)

Clock time drift:	<1 ppm w/ calibration, <127 ppm w/o calibration
Display resolution:	128 x 128 pixels
Display color accuracy:	16 bit