... -ion battery 4.Micro SD/TF 5.Christmas gift Portable Mini Robot Speaker for MP3,MP4,TF card etc.: Product Features1. Cute ... -40mm speakers built in, impressive sound quality, compact and utterly portable -Built-in 800mAh battery, a sound standby time, 4 to ... , broadcast, stop, Volume deductions, Selections of summit - head control The audio source format: MP3 format Pronunciation unit: 40 mm hi-fi ...