Specification: msn: htx8888x@ hotmail.com tel: + 086-755-61333838 URL: http: / / www.htx.en.alibaba.com Output power: 5W ( 2.5W x 2) S/ N: e 90dB Sensitivity: 86dB/ 1w/ 1m Impedance: 4© Frequency Response: 30Hz~ 20KHz Material: ABS Plastic Work with any audio player with a 3.5mm jack Driver unit: 40mm speaker, 4 ohms Power supply