Hign-concerned Chemical: None Model: SK31 Maximum wireless range[m]: 60m-70m Sound Isolating: YES Category: Earphones & Headphones Headphone Pads Material: Silicone Features: waterproof,Active Noice Cancelling With Microphone: Yes Is wireless: Yes Support APP: No Waterproof: Yes Function: for ,For Sport,For Outdoor,For Office,For Study Active Noise-Cancellation: Yes Volume Control: Yes Control Button: Yes Vocalism Principle: air Vocalism Principle Wireless Type: bluetooth Communication: WireLess Style: In-ear Colour: Material:ABS Package Contents: 1 * Mini Earbuds 1 * Charging cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.