Item Type: Microphones Material: ABS plastic Single Microphone Battery Type: Lithium battery (shipped with built in battery) Single Microphone Battery Capacity: 60mah Receiver Battery Type: Lithium battery (shipped with built in battery) Receiver Battery Capacity: 90mah Package List 2 x Microphones 1 x Receiver 1 x Instruction Manual 1 x Data Cable 1Wireless Design: Noise reduction microphone can be paired automatically without any other operation. 2Stable Transmission: Adopting the new 2.4G transmission technology and channel coding technology, even if it is a long distance filming, lavalier microphone can still achieve no lag, synchronization of sound and picture. 3High Sensitivity: Wireless microphones set with strong anti interference ability to effectively identify the original sound, in a noisy environment can still be clear recording. 4Noise Reduction: Built in DSP chip to reduce the impact of noise on the recording, in a noisy environment, a key to start your voice exclusive stage 5Widely Used: 3.5mm receiver with amplifier audio/small speakers sound input amplification use, applicable to tourist guides, teaching and dance.