This high quality compact speaker features:

• Rechargeable Lithium-Ion battery – charges from computer USB port
• Extension cable – for flexible placement of speaker while using the SkyScout.
• Nylon Lanyard – to hang the speaker around your neck while using the SkyScout.
• Expandable woofer – for optimum sound quality

The speakers have been thoroughly tested and guaranteed not to affect the SkyScout pointing accuracy