TDK Life on Record A26 Trek Wireless and Waterproof Portable Speaker Bluetooth v4.0 with support for A2DP streams high-quality wireless audio Built-in microphone for hands-free calls 2.0 stereo configuration -left, right, and 2 passive radiators (two front 1.5" full range drivers, two 2" passive radiators) deliver authentic TDK sound Rechargeable battery Convenient USB charging (no AC adapter)