Main Features Specification: 1. Bluetooth version: V5.0 2. Support up to 64GB TF card (excluding TF card) 3. Charging time: about 2-3 hours 4. IPX4 Sweat-proof, splash-proof and rain-proof. The best choice when exercising or running 5. Frequency Response: 20Hz – 20KHz 6. Support profiles: HSP, HFP, A2DP, AVRCP. packing list: 1*Bluetooth headset, 1*English user manual, 1*Charging cable, 2*Spare earbuds Features: The advanced chip guarantees excellent performance by providing consistent and lossless audio streaming, guaranteeing the stability of the connection signal within 20 meters between the headset and the phone. TF card MP3 music mode Clear sound, HIFI bass 10mm large strong magnetic speaker, good music CVC Audio Technology removes background noise during calls. All day listening (500mAh battery) Enjoy about 40 hours of music time on a full charge About 300 hours standby time Neckband is lightweight and soft material Perfect fit, never fall off The lightweight and ergonomic design fits your ear securely and comfortably. Doesn't fall over even when running. Simple button control Volume control, song change, playback pause, answering and rejecting calls, just press the button on the right earphone, no need to operate on the phone Specification Connectivity Wireless Bluetooth protocol V5.0 Compatible with Mobile phone,iPhone Features Surround Sound Wearing type In-Ear Bluetooth distance W/O obstacles 10m Sound channel Two-channel (stereo) Bluetooth mode Hands free,Headset Battery Type Non-removable