Firing Kit includes: 1 - Unplugged m-Transmitter, 1 - Unplugged 3-mreceiver mTransmitter specs: 2.4GHz operating frequency 2.5mm sync. socket Weight: 1.6 oz / 46 g Dimensions: 2 11/16" x 2 1/16" x 1 5/8" / 68mm x 52mm x 41mm Power source: 1 x 23A battery 3-mReceiver specs. 2.4GHz operating frequency synce socket Power source: 2 x AAA batteries Note: Weight and dimensions do not include batteries or cords.