Brand Name: Remax Model Number: RB-M21 Channels: 2 (2.0) Material: Plastic Battery: 2200mAh Charging Time: 2.5 hours Charging Voltage: 5v 0.7-1A Playback Time: 4-5h (maximum sound) Waterproof rating: IPX5 (SplashProof) Power Source: DC Output Power: 7W Audio Crossover: Full-Range Playback Function: Radio, MP3 Cabinet Material: Plastic Communication: AUX, Bluetooth Speaker Type: Portable Number of Loudspeaker Enclosure: 1 Frequency Range: 65Hz-20KHz Remote Control, Display Screen, Built-in Microphone, Support Memory Card, Support APP, Support Apt-x, Voice Control: No Fetaures Use Bluetooth Smart Memory Pairing to quickly pair devices. ABS material with audio nylon mesh surface, comfortable grip. AUX, memory card, Bluetooth, FM function to receive external audio. Long-lasting, waterproof, wireless restore real voice. Brand Remax SKU 100026097_NP-1019407068 Bluetooth Yes Built-in Battery Yes Model RB-M21 Portable Speaker Features Auxiliary input,3D sounds