HMR : 128g Gertrude ABRAHAM : 540 X 100mm Usa the Included USB cable to charge your headphone. Make sure they are fully charged before first usa Paling SPECIFICATIONS Product and BT version: 4.2 accessories Frequency range: 2 402GHz-2480GHz 1. Windlass headset Loudspeaker size: 40mm 2.U8B cable Transmission range: up to 10M{3F") 3 User manual Power: lithium battery 300mah OPERATION INSTRUCTION Song playing! calling TROUBLESHOOT PROBLEMS Prob lama Solution 1.