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Product Description: The connection only takes a few seconds.These are easy to sync to any device ,Clear quality and low/mid/treble balance, and no issues with clarity when speaking into the mic. Connect seamlessly with all enabled devices up to 30 feet away. Specification: ● Model:i7S TWS ● Version:V4.2+EDR ● Input:DC5V ● Working temperature: -10-55*C ● Charging Time:1-2 hours ● Playing time:3- 4hours ● Speaker impedance:32n ● Microphones sensitivity: 42Db ● Transmission Distance:12M ● Frequency:2.40GHZ ● Battery Capacity: 55MAH/600MAH ● Standby time:100hours Package Included: 2x i7S TWS Earphone 1x Charging Box