Function: Voice Prompt Speaker Unit: 1 Type: Mini Speaker Connection Method: Bluetooth Connection Interface Type: USB Frequency Range: 40hz-20khz Output Power: 3W Signal-to-Noise Ratio: 70dB Power Supply Mode: Built-in Lithium Battery Channel: 5.1 Playing Time: 8 Hours Extended Storage: 32GB Number of Speakers: 1 Effective Distance: 10 Meters Operation Method: Button Applicable People: General Display Screen: None Playback Format: MP3 Shell Material: Plastic Supported Format: TF Card Speaker Adjustable Mode: Button Box Material: Plastic Appearance Size: 97*48 * 82mm Product Weight: 0.19 Item No.: Dw02 Power Type: USB Waterproof Grade: Not Waterproof Bluetooth Version: 5.0 Shell Process: ABS/Plastic Built-in Battery Capacity: 500 MA-800 MA Battery Capacity: 500MAh Bluetooth Protocol: 5.0