Ultimate Ears Hyperboom. Passive radiator size (W x D): 3.5 x 7.48" (89 x 190 mm), Driver diameter: 4.49" (11.4 cm), Tweeter diameter (imperial): 1". Frequency range: 45 - 20000 Hz, Sound pressure level (max): 100 dB. Connectivity technology: Wired & Wireless, Bluetooth profiles: A2DP, Bluetooth range: 1771.7" (45 m). Product type: Stereo portable speaker, Product color: Black, Product design: Rectangle. Recommended usage: Universal