Features: The receiver is build-in chip that can connection with amplifiers, sound cards, cameras, phones, etc. Small size and exquisited appearance, delicate touch, nonslip and wear-resistant, lightweight and easy to carry. Bluetooth-compatible 5.1 version, without loss decoding technology, bringing you better music experience. High sensitivity mic head, 360 degree sound reception, fast response, intelligent noise reduction. Standard 3.5mm port, insert and use, widely used for live streaming, karaoke, video recording, teaching and class and more. Specifications: Material: ABS Type: with single mic, with double mic(optional) Mic Length: approx. 6cm/2.36inch Product Name: K35 Wireless Lavalier Microphone Bluetooth-compatible version: BLE5.1 Port: 3.5mm Transmission distance: 20m Signal to noise level: 64dBm Frequency response: 20Hz-20KHz Battery service life: 8 hours Note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution. Package includes: 1Pc Receiver with 1pc or 2pcs K35 Lavalier Microphone (optional)