I have exactly the same one and it works with lirc_sir driver but there is problem learning remotes that operate on 58k frequency and I believe same problem with transmitting, also you'll need to keep this transmitter very close to controlled device or it wont work. If your cable box does not use 58k or other weird frequency then it should work.
From: Nick Breau
Subject: hardware Blaster Device
Can someone inform me wether the following device could be used as an IR Transmitter via Lirc ? I picked up one of these at a yard sale for 10$ hoping I can use it to change channels on my digital cable receiver using Lirc.
and if not, does anyone have specs for a IR Transmitting device that can be assembled from parts obtainable at radio shack ?