SLX-D+ Digital 2-Channel Wireless Microphone System, includes 1 SLXD4D+ Dual Receiver (1/2 rack) with Bluetooth remote monitoring and control, Audio Summing, AES-256 encryption, Digital Feedback Reduction, networkable, controllable via WWB and Mobile APP, 2 SLXD2+ Handheld Transmitters with Beta®58A Microphone Cartridge (dynamic, supercardioid), rack mount kit, 4 AA batteries, 2 1/4 wave antennas, 2 bulkhead adapters, 2 22" BNC cables, 2 carrying bags, frequency band G57 (470-608 MHz, tuning range 138 MHz)