Xoundstar&reg; Smart Wireless Bluetooth Speaker Portable, High-Fidelity Stereo Speaker with Wireless SIRI Connectivity built-in passive subwoofer with two 40mm, 5-watt drivers 1800 Mah 10 hours Battery for iPhone 4/5/5s/5c,iPad.Samsung Galaxy 4/5 and All Other Android Bluetooth Devices Large, built-in passive subwoofer for enhanced bass Large internal speaker cavity for premium quality performance Easy pairing with Bluetooth and NFC-equipped devices Wireless SIRI connection Two 40mm, 5-watt (total) drivers for powerful sound