Features Best Bluetooth speakers for Smartphone. Support Micro SD card. Ultra-simple style design. Build-in Lion-battery. Metal case design top grade and in style. Ultra-simple style design with compact size. Comply with Bluetooth RF range is up to 10M. Music playback time is up to 5-7 hours. Hand rope design for easy portability. Build-in Lion-battery and can be rechargeable by USB power. Simple pairing with your iPhone iPad iPod touch Android BlackBerry and other devices watching movies playing games is a real enjoyment!. Audio jack work with iPhone iPod phone and other player. Hands-free with microphone design for mobile phone user allow you to mute the music to answer a call directly from the headphones. Specifications Audio Jack - 3.5mm. Working Voltage - 3.7V. Work Time - 5-7 hours. Channels - 1. Color - Silver. Speaker Output - 3W. Battery Capacity - 400mAh. Material - Metal. Special Feature - Wireless Portable Mini. Bluetooth version - 3.0. Loudspeaker - 2.6 3W. Bluetooth Work Range - 10m. Dimension - 4 x 3.75 x 3.75 in. Item Weight - 0.9 lbs.