Shure BLX88 Dual-Channel Wireless Receiver M17 which is 662 to 686 MHZ

Description
The BLX88 Dual-Channel Wireless Receiver from Shure is a dual-channel UHF wireless receiver. It has microprocessor-controlled internal antenna diversity for reduced signal interference and dropouts. The one-touch QuickScan frequency selection feature allows you to quickly locate the frequency with the least amount of interference available.
Its front-panel dual-colour LED status indicator displays green for normal levels and red when clipping for fast metering. It has two XLR outputs in additional to two instrument-level 1/4″ outputs. The BLX88 can be used with up to 11 other compatible systems simultaneously per frequency band.
M17 which is 662 to 686 MHZ
Specifications

Output
2x XLR Output2x 1/4″ (6.35 mm) Output

Output Impedance
XLR: 200 ohms1/4″: 50 ohms

Audio Output Level
XLR Connector: -20.5 dBV into 100 kOhm Load (Reference +/-33 kHz with 1 kHz Tone)1/4″: -13 dBV into 100 kOhm Load (Reference +/-33 kHz with 1 kHz Tone)

RF Sensitivity
-105 dBm for 12 dB SINAD, Typical

Image Rejection
>50 dB, Typical

Housing
Moulded ABS

Power Requirement
12 to 15 VDC @ 320 mA, Supplied by External Power Supply (Tip Positive)

Dimensions (H x W x D)
1.5 x 15 x 4.5″ (40 x 388 x 116 mm)

Weight
15.1 oz (429 g)