Interconnecting two speakers: When two machines are on, press the power button of one device twice, and when you hear a sound, the two devices are connected in series; Connect your phone to one device, then turn on another device and double tap the speaker without the phone link Power supply method: built-in lithium battery Logistics service: delivery door-to-door Storage card type: does not support expansion cards Frequency response range: 20Hz-20KHz Playback format: MP3, WMA, WAV Packing List: Mainframe Charging Line Box Instructions Hanging Rope Number of speakers: 1 Speaker adjustment method: Buttons Audience applicable: general Capacity battery capacity: 200MA Quality Waterproof: ipx 1 Power Mode: USB Capacity: internal battery current: 300mA -500mA Shell process: anodized metal shell Output power: less than 10W Body color: black gold, silver, blue, Chinese red Connection method: Bluetooth connection Interface type: USB Applicable scenarios: car, office, fitness , outdoor, home, portable, outdoor lawn Appearance size: 39*39*32MM Channel: 2.1 Operation mode: button type Unit; horn: one 4 3W Playtime: 2 hours Effective distance: 10 meters Signal-to-noise ratio: 70db Type: Bluetooth speaker Note: Please accept 1 to 1 error. 3cm due to manual measurement. Please make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you