Anmery Wireless Earbuds With Wireless Charging Case Wireless Bluetooth 52 In Ear Built-In Microphone With Mic Noise Cancelling Headphones Premium Sound For SportsSpecifications: Bluetooth Version: V 52 Frequency: 2402gHz-2480ghz Transmission Distance: 10m33feet Battery: 37V120mA li-polymer Music time: 4-5 hours Standby Time: up to 72 hours chargi..