Mackie MP-220 BTA, In-Ear Monitors and Bluetooth Adapter Set, Consists of the Mackie MP-220 and MP-BTA adapter@+*MP-220 Dual Dynamic Driver In-Ear Monitors:*@+@+, Impedance: 8 Ohm, Sensitivity: 104 dB, Transducer type: Dual dynamic, Frequency range: 20 - 20,000 Hz, Ergonomically designed low-profile housing, High-fidelity cable with removable MMCX connector, Colour: Black, Includes a hardshell case, gold-plated 3.5 mm jack to 6.3 mm jack adapter, ear tips (foam, silicone and double flange) in 3 sizes each@+*MP BTA Bluetooth Adapter:*@+@+, Bluetooth 4.0 technology, Wireless operation with in-ear monitors from the Mackie MP series, Can be paired with any Bluetooth-enabled device, Integrated microphone- and telephone interactivity allows you to accept calls and operate music playback, MMCX connector