Poweradd Bluetooth Speaker Wireless Portable Speaker with Sensitive Touch Control, Dual Bass Stereo Loudspeaker & Superior Surround Sound, NFC, Build in Microphone for IPhone, Samsung, Tablet - Black Superior clarity stereo sound: implemented with Bluetooth 4.0+EDR technology guarantees lower power consumption and the stable crystal clear audio. Contains two highly powerful 50mm total 6W stereo acoustic drivers and sensitive touch screen for easily controlling the speaker. Built-in rechargeable battery for up to 12 hours of play time. Built-in microphone for hands-free speaker phone calling. Compact design: Small size (6.1x2.6x3.0 inches) and light weight (12.7 oz) make it portable and convenient to use. Multiple ways to connect: Bluetooth connection/NFC connection/3.5mm AUX Line-in connection for non-Bluetooth devices.