Specification: 
· Bluetooth chip CSR8635 V4.0 IPX4 waterproof Magnet neckband
· Bluetooth protocol: HSP V1.2, A2DP V1.2, AVRCP V1.4, HFP V1.6, DI V1.3;
· Bluetooth effective distance: 10 meters
· Battery: polymer battery 3.7V 220mA;
· Headphone Driver: 16Ω 2 * 5mW;
· Working current: about 25mA;
· Frequency: 100Hz-10KHz;
· The charging time is about: 2H
· Music playtime: 8 hours, 10 hours of talk time;   
· Material: silicone+ PU leather + ABS + TPE                    

 Feature:
· Wireless Bluetooth Input
· Hand-free function
· Play/pause
· Smart 1 for 2
· IPX4 waterproof
· Connect with 2 device at same time,Redail, 
· Support systerm:WP,ANDROID,IOS. Smart voice control. 
·Automatically voice play phone numbers call,Bluetooth paring and cacelling,  Headphone battery display.  
·One headphone for two bluetooth device. Smart voice assistant function