Ear clip design open-ear headset: Open-ear headset, more transparent sound, more comfortable and safer to wear ENC HD call noise reduction: Brings clear calls and gaming voice communication Lossless sound transmission: 360° panoramic sound effect, directional conduction without sound leakage Easy to use: Touch control dsign, Hall switch, automatic connection when the headset is taken out IPX5 sweatproof: Life grade waterproof and sweatproof, perfect for sports and daily use Low latency: Zero latency in games, stable transmission, audio and video synchronization Incoming call voice reminder function: With incoming call number reminder, intelligent voice prompt (default English) Bluetooth-compatible 5.4 version: Stable connection without interference, bringing smooth video and audio experience Specifications: Product model: F16 Bluetooth-compatible solution: BLUETRUM 5656A2 Bluetooth-compatible version: 5.4 Bluetooth-compatible protocol: A2DP/AVDTP/AVRCP/RFCOMM/HFPHSP/SPP/HID Channel system: stereo Working voltage: 3.0-4.2V Working current: 10mA Charging voltage: DC 5V Power consumption when powered off: 8uA Charging current: 40mA Battery capacity: 50mAh Charging time: about 1H Listening time: 80% volume, about 7 hours; maximum volume, about 6 hours Talk time: 5H Standby time: 180 days Working frequency: 2.4G Effective distance: 10 meters Speaker parameters: Sensitivity: 115±3dB(at 1KHz 1mW) Impedance: 20±10%Ω Frequency range: 20~20KHZ Output power: 5mW Microphone parameters: Sensitivity: -38dBV/Pa Impedance: 400 Headphone charging case performance parameters: Battery capacity: 400mAh Input voltage: 5V Input current: 320mA Output voltage: 5V Output current: 50mA + 50mA Charging time: 1.2 H (charged at 1C) Rechargeable times: charge the earphones about 3 times Static standby current: 25uA (no load) Net weight: 59G (earphone weight: 10g, charging box weight: 49g) Earphone size: 29*29*14mm Box size: 67*47*44.5mm Package included:1 x Pair of Bluetooth-compatible Earphones1 x Charging Case1 x TYPE-C Charging Cable1 x English and Chinese User Manual