GLX-D+ Dual Band Digital Wireless is the perfect solution for musicians and presenters who want to go wireless with confidence, and without complexity. Every aspect of its operation is managed automatically and with total reliability, allowing you to focus on your performance. With new Dual Band Wireless Technology, GLX-D+ can operate in both 2.4 and 5.8GHz, more than doubling the available bandwidth while also intelligently avoiding interference for reliable, dropout-free audio. Featuring smart rechargeability with up to 12 hours of runtime (improved from prior generation GLX-D), the included lithium-ion battery can be charged multiple ways and offers quick charge capabilities. Available with multiple legendary microphone options (including the SM58) in tabletop, half-rack and guitar pedal system configurations. When combined with Frequency Manager and directional antenna accessories (both sold separately), the rack-mount receiver systems are ideal for small and medium installations where a larger number of channels is needed.Featuring the industry standard SM58 vocal microphone, the new GLXD24+/SM58 Dual Band Vocal System delivers superior, transparent digital audio. The perfect combination of the automatic frequency management with the new Dual Band Technology provides reliable and consistent performance while Shure proprietary Lithium-Ion rechargeable batteries provide up to 12 hours of use. Go wireless without complication.Specifications:GLXD4+:Tuning Bandwidth:Z3: 2400 – 2483.5 MHz and 5725 – 5850 MHzTransmit Mode:Shure proprietary digitalRF Output Power:10 mW E.I.R.P. maximumAmbient Temperature Range:Charging: 0C (32F) to 40C (104F)Operating: 0C (32F) to 45C (113F)Polarity:Positive pressure on microphone diaphragm (or positive voltage applied to tip of WA302 phone plug) produces positive voltage on pin 2 (with respect to pin 3 of low impedance output) and the tip of the high impedance 1/4- inch output.Audio Frequency Response:20 Hz 20 kHzDynamic Range:122 dB, A-weightedRF Sensitivity:-88 dBm, typicalTotal Harmonic Distortion:0.2%, typicalBattery Life:Up to 11.5 hoursChannel Count:Up to 4 typical, 8 optimal2.4 GHz only: Up to 4 typical, 5 optimalGLXD2+/SM58:Power Requirements:Shure Rechargeable Li-Ion Battery: SB904USB Power Supply (US/Canada): SBC10-USB15WSUSTWJDimensions:9.69 in. (246 mm)Weight:SM58: 9.7 oz (275 g), without batteryHousing:Aluminum alloy, ABS plasticMaximum Input Level:SM58: 146 dB SPL