・Bluetooth-compatible 5.3 Connection:Ultra-low latency keeps synchronized with audio and video,convenient to keep in contact with your teammates all the time ・Immersive Stereo Sound:Adopting powerful driver units,making the bass punchier and midrange full and textured,treble crystal crisp,provides you with stereo surround sound ・Waterproof Design:The headsets are protected against damage from sweat and light rain. Perfect for sports and workouts ・OWS Ear Hook Wearing:No need to jam the earphones into the ear to better protect the hearing. Unlike in-ear headphones,it allows you to keep in touch and understand the surrounding environment to ensure safety ・Compact Size:The compact body fits easily in your pocket,convenient to carry when traveling,cycling,etc Specification: ・Bluetooth-compatible version:V5.3 AD6973D4 (with amplifier) ・Supported protocols:A2DP,HFP,AVRCP ・Battery capacity:Earphone:65mAh * 2 (earphone battery without protection board,earphone board lithium battery protection IC);Charging bin:400mAh (with protection board) ・Charging time:1.5h ・Talk time:7.5h ・Play time:8.5h ・Standby time:200h ・Built-in speaker: ・Size:10*8.5*2mm square speaker ・Sensitivity:119±2dB (800MV 1KHZ) ・Impedance:30Ω ± 15%Ω,at 1KHz ・Output power:21mW ・Microphone: ・Sensitivity:-42DB ±2 ・Impedance:400Ω ・Noise reduction method:single microphone DNS call noise reduction ・Input charging standard:DC 5V ・Bluetooth-compatible operating frequency:2.402G-2.480G ・Frequency response range:20-20KHz ・Maximum transmission distance:15m ・Voice prompt:Supported ・Multi-point connection:Not supported ・Wearing method:Ear hook ・Waterproof level:IPX4 ・Charging interface:Type-C Package included: ・1 PairxEarphone ・1xCharging Bin ・1xCharging Cable ・1xEnglish and Chinese User Manual ・Other things not included