Micro Transmitter leg mount 216Mhz and 218Mhz, 434Mhz. Our stock frequencies are 216, 218 and 434. If you need 217 or 219 or 433 frequencies this can be ordered and will take about two weeks to be made up.The Ideal leg mount for all small to medium size birds. At only 3.5 grams of battery weight this is a high-power, long range design putting 1/3 the weight on a single tail feather. Unlike other transmitters using very small batteries, the new Micro doesn't fade out or die in low temperature situations. It is perfect for small specialty birds: Perfect for Merlins, sharp-shinned hawks and also great for medium size raptors too. The Micro also contains the magnetic 'tap on/tap off' switch, a half-length 7-inch antenna with improved power and efficiency over the old Micro. Each unit is burned in for five days and Enviro-tested tested from +150F down to -40F prior to shipping. (One battery and one magnetic wand are included with each Marshall transmitter.)MT-23 Micro leg mount $225.00Comes with a three year warranty.