Overview:You can listen to music by pairing your BT-enabled audio devices with the speaker. Mini and portable, you can just put it in your pocket, or hang it on your backpack with a lanyard. It is perfectly suitable for home use, office use, and outdoor activities.Features:Support wireless music from your BT-enabled audio devices. Also supports TWS function.Built-in 4W speaker brings you perfect music and high-quality loud sound.Built-in rechargeable 400mAh battery ensures about 2.5 hours of music playing.With a portable lanyard, you can hang it on your backpack, or just put it in your pocket.CNC seamless cavity processing, durable to use, ensures better sound quality.Specifications:BT version: 5.0Operation range: 10mPower output: 4WHigh-quality built-in rechargeable Li-ion battery: 400mAhMusic Playing Time: about 2.5 hoursFrequency Response Range: 20Hz ~ 20KHzColor: Black, Gold (Optional)Main Item size: 5.0 * 3.4cm / 1.96 * 1.33inMain item weight: 67g / 2.36ozPackage size: 11.3 * 7.2 * 4.1cm / 4.44 * 2.83 * 1.61inPackage weight: 99g / 3.49ozPackage List: 1 * BT Speaker1 * USB Cable1 * Lanyard1 * User Manual