Riwbox WT-7S Bluetooth Headphones, LED Light Up Wireless Foldable Stereo Headset with Microphone and Volume Control for PC/iPhone/ TV/iPad (Blue)

Specifications:  Speaker diameter: 40mm  Speaker impedance: 320hm Speaker sensibility: 108db+/-3db  Frequency response: 20-20000Hz  Working voltage: 3.1-4.2V  THD: Mic sn ratio: 40db  Mic freq response: 100Hz-80KHz  Speaker impedance: 32~ ...