· 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