1 piece Original HöRMANN hand-held transmitter / remote control complete with battery and instructionsType: HSM4 mini hand-held transmitterFrequency: 868.3 MHz4-channel (= 4 buttons for 4 functions / door operators)Button colour: blueBattery: 12V type 23AAdimensions: 37 mm x 60 mm x 12 mmYour old HöRMANN hand-held transmitter must have the same button colour as the new hand-held transmitter.It's so easy to find the right frequency:Light blue buttons = 868.3 MHz ( = not suitable for Series 3 - BiSecur!)Grey buttons = 40.685 MHzGreen buttons = 27 MHz (exactly 26.975 MHz)DIY series = 433 MHz RC (Ecostar)The frequency is also printed on your HöRMANN drive and on the back of the hand-held transmitter. If your drive is not from HöRMANN, these hand-held transmitters will not fit Please note that the new hand-held transmitter types which are only specified with 868 MHz are not available for the old frequencies 40.685 MHz and 26.975 MHz.This hand-held transmitter replaces the models HöRMANN HS4 868 MHz, HöRMANN HSD2 868 MHz, HöRMANN HSD2 CHROM 868 MHz, HöRMANN HSP4 868 MHz, HöRMANN HSP4-C 868 MHz.