Bluetooth version: 5.0. Propagation speed: 25mah. Valid range: 15m. Support agreement: A20DP/A VRCP/HFP/HSP. Packing list: a pair of earphones, charging compartment*1, data cable*1, packing box*1,. New Bluetooth 5.0, stable and low latency; connect immediately after opening the warehouse, and you can listen when you take it out; shocking sound quality, long-lasting standby; double diaphragm, double shock; high-definition call, realize binaural high-definition call, enjoy HIFI-level sound quality experience . The stable Bluetooth signal can ensure uninterrupted reception up to 15 meters.