1: Bluetooth connection
2: microphone function
3: hands-free mode to answer the phone
4: Super sucker function. (2 mm thickness breast silicone silicone sucker)
5: with super bass function. (full band horn)
6: shockproof, anti fall, a certain waterproof function      
Product specification:  
Bluetooth version: V4.2+EDR
USB input voltage: 5V
Charging time, 2 hours
Battery capacity: 200mAh
Rated power output 3W
Speaker specification 13 core inner magnetic single core
Lithium battery specification; 3.7V
Signal to noise ratio: 90HZ-20K/65dB