Overview: Supply Voltage:3.7V 600m A Charging Voltage:DC5.0V 500m A Output Power:3 W Frequency response:80 Hz-20 K Hz SNR:80 Db Distortion:0.3%TF Card Reader MP3 Player amp; Card Reader Speaker MP3 Player Supports MP3 Audio Format Support TF Card Up To 8GB (Not Included) Built-In Lithium Battery (can play 3~5 hours for fully charged) Just Use One TF Card For Both The MP3 Player & Speaker Carry The MP3 Player When You Are Out & Export The Music To The Speaker When At Home Specification: Weight Approx:130g Size Approx:11.6 x 6.6 x 3.5