In-ear monitors + BT Connector Dynamic full-range transducer for high-resolution, powerful monitoring sound Reduces acoustic stress factors through natural and distortion-free reproduction 2 in 1 bundle: Bluetooth® module for wireless connection to mobile devices, PCs or tablets, with a built-in microphone for calls or standard 3,5 mm jack-plug cable Excellent shielding through optimized earpiece shape and flexible silicone and foam attachments