Lectrosonics SSM E01-A1, Digital Hybrid UHF Micro Miniature Pocket Transmitter, Digital Hybrid Wireless Audio for compander-free digital quality, Frequency range (A1): 470.100 - 537.575 MHz, Selectable transmitting power: 25 / 50 mW, Connector: LEMO 00 Series 3-pin, Gain control in 1 dB steps, Different compatibility modes for use with earlier receivers, Adjustable frequency steps: 25 kHz / 100 kHz, Optional smartphone app for Android and iOS for remote control (not included), Exchangeable lithium-ion battery, IFB mode, Battery life: approx. 6 hours, Dimensions (H x W x D): 59 x 38 x 15 mm, Weight: 66 g, Includes lithium battery, charger, pouch, 2 belt clips and 3 P1311 USB connectors