Ultimate Ears WONDERBOOM™ 3. Passive radiator size (W x D): 46.1 x 65.2 mm, Driver diameter: 4 cm. Sensitivity: 86 dB. Connectivity technology: Wireless, Bluetooth profiles: A2DP, Bluetooth range: 40 m. Product type: Stereo portable speaker, Product colour: Grey, Lime, Product design: Cylinder. Recommended usage: Universal