The first step towards Shure's excellent technology, BLX wireless systems are available in a wide range of configurations with single, dual or rack-mount receivers, to meet multiple applications. They deliver excellent audio quality thanks to a frequency response close to the wired version and offer up to 12 compatible frequencies per band. The sets with BLX4 or BLX88 receiver are characterized by their ease and speed of implementation thanks to their integrated antennas. The BLX4R rack-mount receivers with their detachable antennas allow the use of antenna extensions and antenna distributors and are suitable for economical fixed installation. - Transmitter screen display: No - Power supply: Transmitter: 2 AA alkaline batteries, Receiver: mains - Detachable antenna: No - Battery life: 14 hours max. - Frequency band: M17 - 662 to 686 MHz - Capsule: static - Interchangeable capsule: No - Category: complete headband system - Transmission encryption: No - Directionality: cardioid - Max. number of simultaneous systems: 12 - Indicative range: 80 m - Transmission power: 10 mW - Frequency response: 50 Hz - 15 kHz - Frequency scanner: Yes - Transmitter sync: QuickScan - Transmission: analog - Additional specs: - Molded ABS plastic transmitter and receiver - PGA31 headband microphone