Product Parameters: Wireless Version: V4.2 Wireless Transmission Distance: 20M Impedance: PCB Serpentine Antenna Sensitivity: 4dbm Frequency Response Range: 40-17KHz Speaker: 2.5* 3, 10W Output Power: 10W (Max) Battery: Cylinder 2000mAh (Lithium Battery) Charging Voltage: 5V=1A Product Size: 110mmx160mm Product Weight: 630g Playtime: About 3Hours Features: AUX/BT/TF/TWS interconnection of two speakers/Hands-free calling Distortion: 3.5% SNR: 70db ERK 1010 TF/MICRO SD Lightweight Skin-friendly Materials Wireless Technology High-resolution Audio Round the touch button at the top for volume control. Circular status indicato. Cylinder design combining cloth creates a stylish look. The tapered design of the speaker's inner cavity, together with the the specially-designed speaker delivers great acoustic sound. One button to easily switch on/off Two buttons at the bottom: MODE/function button, TWS Pair button. Click TWS/Pair button for TWS interconnection of two speakers; press and hold the button to disconnect the wireless connection. You can use both speakers or either one of them as you want. Product Features: Superlong time standby Night light function AUX input Bass enhancement Pure Sound Lossless Transmission Specification: Brand Name: Remax Model number: RB-M40 Item Type: TWS Wireless Bluetooth Speaker Material: ABS+PC Bluetooth Version: V4.2 Communication Distance: 10m Frequency Response Range: 40ZH-17KZH Sensitivity: 4dB Distortion: 3.5% Power Output: 10W (MAX) Battery Capacity: 2000mAh Charging Voltage: DC5V/1A Working Time: 3 Hours Standby Time: 180 Hours Suitable For: Bluetooth Enabled Devices receive the radio: no Size:11cm X 16cm Color: Gray, Black