The Tx Plus Micro Transmitter requires NO BATTERIES, a technology that has yet to be matched by any competitor SEALED PLUG-IN UNIT WITH FM RADIO TRANSMITTER - Crystal controlled Phase Lock Loop (PLL) with Patented digital transmission of codes, with tones and battery condition warnings (where applicable) from Delkim Plus range bite alarmsNO BATTERY REQUIRED - Plugs into audio output of Delkim Standard Plusor Ev PlusTHE ORIGINAL PATENTED AUDIBLE AND VISUAL REPLICATION SYSTEMUNIQUE INDIVIDUAL TRANSMITTER CODES - To prevent activation of other users receiversALL THE TRANSMIT FUNCTIONS OF THE Tx-i Plus - (Except anti-theft alarm and range check)EXTERNAL COIL AERIAL - Maximises performanceHARMONISED PAN-EUROPEAN FREQUENCY WITH DECLARATION OF CONFORMITY - Conforms to EN300-220DEDICATED DESIGN FITS ONLY DELKIM PLUS RANGE BITE ALARMS - (Standard and Ev)NITELITE OUTPUT (2.5mm) - For connection of optional Delkim NiteLite Pro™ Illuminating HangerINCLUDES REPLACEMENT 1¼" STAINLESS STEEL LONG BOLT - Required for fittingPRICE - £55.00http://i49.tinypic.com/64mrcy.jpg