Mini Speaker with great frequency range and balanced sound. TWS - True wireless stereo to link 2 speakers wirelessly. Built out of high quality aluminum. Bluetooth version 5.0. Hands Free phone calls using the built in microphone. Built-in SD Card Slot. On android phones, you can use the speaker as a selfie remote. Input Voltage: DC 5V 1A. Li-Polymer battery: 300mAh. Driver: 40mm, 4O 3W. Net Weight: 95g. Sound output: 5W. Bluetooth range: 25 Feet. Frequency response: 120HZ-20KHZ. Charging Time: 30 - 40 minutes. 25% volume battery life: 5 hours. 50% volume battery life: 3.5 hours. Max volume battery life: 2 hours. Color: Black The Kicker KMF 10-inch Marine Subwoofer makes serious bass - no enclosure necessary! Made to take the power and the weather, this sub is custom made to bang in your boat. Packed with features and made for marine, KICKER gives you the deep, loud bass your boat needs with the KMF series of subs.