Highlights: Output Power: RMS 3W*2 Speaker: 4Ω,3w,φ40mm Battery Capacity: 350mA Bluetooth Version: 4.2 Maximum consumption current: headphone mode 100mA, speaker mode 250mA Input Power: DC5V 500mA Frequency Response: 90-18Khz Sensitivity: 500 mv±50 mV Signal To Noise Ratio: >70db The Distortion Degree: <0.3% Playing Time: headphone mode around 7 hours, speaker mode 3.5 hours Charging Time: About 2h Functions: Bluetooth/NFC/FM Radio/SD Card/Audio In Product Description: Advantages: Voice tone 2in1 Bluetooth Headphone + Bluetooth Speaker Stereo sound, bass. NFC Special for Android System Cellphone Hands-free Calls TF Card MP3 Music Player FM Radio Support Audio input function (AUX) for Smartphone /Computer /MP3MP4 Player Features: Two-way Sounds: Headphone and speaker modes. Headphone Mode -Once you want to escape the world temporarily and enjoy the music just alone ,please twist the earcups inwards speaker mode-earcups are twisted to outwards direction, the speaker mode is activated . It blends people with people ,and music it’s better to share your joy with others rather than to keep it yourself ! What’s in the box: 1x 2 in 1 Bluetooth Headphone 1x Audio Cable 1x Usb Charging Cable 1x User Manual Weight: 0.5 SKU: 210303120700