La description de Scan-Lock

Scan-Lock is the simplest way to change Whelen flash patterns. Designed for optimal convenience, Scan-Lock features an easy to use interface and utilizes a Bluetooth connection.
Download the Scan-Lock app and browse, test, and assign Whelen flash patterns right from your phone.
Key Features
Scroll and Update Flash Patterns
Using a Scan-Lock Programmer, pair any compatible Whelen lighthead with the Scan-Lock app and easily browse, test, and assign flash patterns.
Test Flash Patterns
Preview any flash pattern for up to 20 seconds.
Easily Access the Steady Pattern
Enable the steady option right from the top of the flash pattern list.
Bluetooth Connectivity
The Scan-Lock app communicates to a Scan-Lock Programmer via Bluetooth connection.
Supported Whelen Lightheads
Compatible with any Whelen lighthead that supports Scan-Lock or the original Scan-Lock.
A Scan-Lock Programmer is required to use this app.
See more at http://www.whelen.com/scanlockplus