Fatboy Wireless NackBand

*Wireless Music NackBand FB-058 * Sport wireless headset has magnets-when you're not using the earbuds, simply clip them together around your neck. **wireless version: v4.2+EDRV1.0V1.1V1.2V3.0 ** Transmission range:20M Charge voltage:5v/100MA-300mAh ** Backup:40H 🔋 capacity:560mAh Working voltage: 3.6v-4.2v Full Replacement warranty for manufacturing defects Anytime.