The new GLX-D+ Dual Band Wireless Rack System features the premium wearable WL185 lavalier microphone for spoken word applications and the GLXD4R+ half-rack receiver. 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.