Featuring the industry standard BETA58A vocal microphone, the new GLXD2+/B58 Dual Band Handheld Transmitter delivers superior, transparent digital audio.Main Features:Featuring the industry standard BETA58A vocal microphone, the new GLXD2+/B58 Dual Band Handheld Transmitter 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:In the Box:1 SB904 Lithium-Ion Rechargeable Battery1 Swivel Adapter