BLX14UK/MX53-K3E Wireless System, Frequency Band Version: 606-630 MHz (K3E) on channel 38.

The Wireless Presenter System with MX153 is a professional subminiature earset microphone ideal for speech and other applications requiring low-profile discreet placement where improved gain before feedback over lavalier microphones is desired. 

Includes MX153 earset microphone, BLX1 bodypack transmitter, BLX4R rack mount receiver, single and dual rackmount kit, two 1/4 wave antennas, zipper bag, power supply, 2 AA batteries, and user guide.

Specifications: 

• Compatible systems per frequency band: Up to 12
• Selectable frequencies: Up to 150
• Auto Setup Features: QuickScan - finds group with most compatible frequencies and sets to best frequency
• Audio Reference Companding: Yes
• Included Antennas: Internal
• Transmitter Display: LED
• Receiver Display: LED
• Battery, Endurance: 2AA, up to 14h
• Environment: Daily Touring
• Operating Range: 91 m (line of sight - actual range depends on RF signal absorption, reflection and interference)
• Operating Frequencies: 606 - 630 MHz
• Audio Range: 50 Hz - 15 kHz (dependent on microphone type)
• Transmitter RF Output Power: 10 mW, typical (varies by region) 

• Audio Output Connector: XLR and 1/4" (6.3 mm) unbalanced
• Maximum Output Level: -27 dBV (XLR, mic level), -13 dBV (1/4") 

• Battery Life: Up to 14 hours
• Dynamic Range: 100 dB A-weighted
• System Distortion: 0.5 THD typical (ref. +/- 38 kHz deviation, 1 kHz tone)
• Operating Temperature Range: -18°C (0°F) - +50°C (122°F) 

BLX4 Wireless Receiver

• Output Impedance:
• XLR Connector: 200 Ω
• 6.35 mm (1/4") Connector: 50 Ω
• Audio Output Level Ref. +/- 33 kHz deviation with 1 kHz tone:
• XLR Connector: -27 dBV (into 100 kΩ load)
• 6.35 mm (1/4") Connector: -13 dBV (into 100 kΩ load)
• RF Sensitivity: 105 dBm for 12 dB SINAD, typical
• Image Rejection: >50 dB, typical
• Dimensions: 40 mm X 188 mm X 103 mm (H x W x D)
• Weight: 241 g
• Housing: Moulded ABS
• Power Requirements: 12–15 V DC @ 160 mA, supplied by external power supply (tip positive)

BLX1 Bodypack Transmitter

• Audio Input Level:
• Gain max: -16 dBV maximum
• Gain min (0 dB): +10 dBV maximum
• Gain Adjustment Range: 26 dB
• Input Impedance: 1 MΩ
• RF Transmitter Output: 10 mW, typical, varies by region
• Dimensions: 110 mm x 64 mm x 21 mm (H x W x D)
• Weight: 75 g, without batteries
• Housing: Moulded ABS
• Power Requirements: 2x LR6 AA batteries, 1.5 V, alkaline
• Battery Life: up to 14 hours (alkaline)

Manufacturer: Shure