High sensitivity mic has strong ability to anti-interference, which can provide high performance. Wireless transmission space is up to 30m, which is practical. Large capacity battery provides long standby time, bringing 6 to 8 hours work time. It is comfortable to wear the microphone with ergonomic design. Made of premium plastic and metal material, the wireless earphone is durable and reliable. Length of the receiver is 6.5cm, width is 3cm and thickness is 2cm. It is suitable for teaching, stage performance, outdoor activities, etc. Item Name: Wireless Microphone Material: Plastic,Metal Charging Time: 4 Hours Battery Capacity: 450mAh (Included) Charging Interface: Micro-USB Transmission Distance: 30m Using Time: 12 Hours FM Transmitting Frequency: 2400Hz Auto Pairing: Yes Size Details: Receiver Size: 6.5cm x 3cm x 2cm/2.56" x 1.18" x 0.79" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Transmitter 1 x Receiver 1 x 6.35mm Adapter 1 x User Manual 1 x Sponge Pad Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.