The Shure SB902 is a replacement battery for Shure GLX-D and MXW handheld wireless transmitters, and having a few extras around will give you serious peace of mind. We know that a single battery can make or break an entire performance. You won’t have to worry about mics dying on stage when you have some extra SB902 batteries charged and ready to go. If you rely on Shure GLX-D or MXW wireless handheld transmitters on stage, don’t be caught without a Shure SB902 replacement battery. Shure SB902 Rechargeable Battery for GLX-D Wireless Features at a Glance: Rechargeable Lithium-ion battery for Shure GLX-D and MXW handheld wireless transmitters Keeps some extras charged up to ensure your mics will always have power ready to go Easy recharging with the SBC902 dock charger (sold separately).