Hello,
Its not a Sigma MPT1340 (All UK remotes have MPT1340 licence exempt on them) so the first thing you need to do is identify the fob you need. It should say AC ** or AC *** on the back. Some of the Sigmas dont let you change the battery as its a sealed unit. Replacement of the whole fob is the only option. Contact Tech-Tronics 0161 869 0050 , they specialise in Fobs of all sorts and can advise you.
Steve, October 2010
