Communication: USB Communication: Bluetooth Battery: Yes Speaker Type: Portable Power Source: DC Number of Loudspeaker Enclosure: 2 Cabinet Material: Metal Audio Crossover: Two-Way Channels: 2 (2.0) Input Power(W): <25 W Intelligent Personal Assistant: None Output Power: 20W Remote Control: No Support Memory Card: Yes Playback Function: Radio Playback Function: mp3 Display Screen: No Material: Metal Support Apt-x: No Waterproof: Yes Built-in Microphone: Yes PMPO: 20W Feature: Phone Function Feature: Dolby Digita Feature: DTS Feature: Wireless Charger for Mobile Phone Feature: Play Video Feature: Video Call Frequency Range: 75Hz-20KHz