... Transmit the music by BT to the speaker Plastic housing rechargeable Li-ion battery Usage:Connect with your phone1, Turn on the power, ... : 4Ω 3W*1Signal and noise ratio: ≥ 80dBBuilt-in battery : Aluminum battery, 3.7V/400MAHUse of time: 2-5 hours, due ... , apply to PC,mobile phone,mp3.mp3, etcMetal housingrechargeable Li-ion battery ,2hrs music playbackA2DP function Work with TF card Accessories:3 ...