Features: Wireless/wired dual-mode monitor headphones, suitable for monitoring of DJ, music recording, electronic keyboard, drum machine, electric guitar, etc. Adopts 40mm speakers, with high sensitivity, wide response and large dynamic. Built-in 950mAh rechargeable lithium battery, supports up to 50h working time. 3.5mm & 6.5mm dual interface design makes it compatible with not only various musical instrument, but also smartphones, tablets, computers, etc. Soft ear pads and Self-adjusting headband for secure and comfortable wearing. Specifications： Color: Black/ Brown(optional) Speaker Diameter: 40mm Impedance: 32Ω Sensitivity: 110dB±3dB Frequency Response: 20Hz-20KHz Connector: 3.5mm/6.5mm stereo Package List: 1 * Headphone 2 * Audio Cable 1 * Storage Bag 1 * USB Charging Cable