UHF Wireless System, 1 Fixed frequency, ISM band, Non-diversity, A maximum of 2 transmitters from the TWS One Series can be operated simultaneously with varying frequencies (A, B, C or D), Jack output, Pocket transmitter with 3.5 mm jack connector, Operates with 2x AA batteries, Frequency: A (863.100 MHz), Includes a condenser lavalier microphone (directional characteristic: cardioid), jack-jack cable, and a carrying case.