Remax RB-T1 wireless handset. Allows you to play music in the best sound quality as well as handle calls efficiently. Wireless transfer allows for convenient use and eliminates the problem of tangling wires once and for all. The special design fits the ear perfectly, providing comfort and convenience without feeling heavy. Universal - the earphone lets you talk and play your favorite music wherever you are. Built-in microphone for making calls. Includes: earphone, USB / micro USB cable, user manual. Specification: Bluetooth version: 5.0 Range: 10 m Frequency: 20Hz-20KHz Transducer: 10 mm Impedance: 16 Ohm Power: 10 mW Sensitivity: 92 dB Microphone sensitivity: 42 dB Talk time: approx. 4 hours Music playing time: approx. 3h Standby time: approx. 120h Charging time: approx. 1.5 hours Battery capacity: 55 mAh Weight (earphone): 5.6 g