The Jass Flasher Relay Module plugs in and installs like the OEM module, but does not allow hyper-blink even if all indicator bulbs are changed to LEDs. The advantage of LEDs is the light output, more intriguing light patterns, especially in combination with TSIs, less power drawn from the alternator as well. The OEM system needs 94W (4x21+2x5) vs close to 10W if LEDs are used.
The Jass Flasher modules have integrated buzzers providing this feedback in a good pleasant way.
The casing and connectors replicate the OEM one.
This module is required when using TSI such as Jass Sequential Stealth TSI
Please note, you should still reuse the OEM flasher module for full OEM flasher bulb setup and the Digital Flasher Module in case you are using LEDs.