What's in the box:

UHF Wireless Microphone System Dual Dynamic Handheld Mic + One Mini Receiver 50 Channels for Karaoke Singign Business Meeting Speech Home Entertainment (Standard)

Features:
UHF wireless microphone system with dual handheld mics + one mini receiver for karaoke, party, DJ, business meetings, speech or other outdoor & indoor activities.
High-quality sound transmission, clear voice and low noise, without feedback and free from distortion, suitable for live performance.
50 selected channels, supports using up to 16 sets at the same time; and the effective transmission range is about 30-50M in open area.
The receiver with 6.35mm(1/4") connector, plus the included 6.35mm to 3.5mm adapter, you can connect it to your speakers or amplifiers easily.
Plug and play, easy to use, and the battery-powered microphone and wireless receiver allow you to move freely on stage or in the room.

Specifications:
Effective Range: 30-50M without obstacle
Channel: 50 channel, at most can use 16 sets at the same time
Frequency Stability: + 0.005%
Signal to Noise Ratio: 100dB
Max. Output Sound Pressure: 130dB
Microphone Head: Moving-coil
Microphone Power Supply: 2 * AA Batteries(not included)
Receiver Power Supply: 1 * 18650 Battery(not included)
Microphone Size: 25.5 * 4.5 * 3cm/ 10 * 1.8 * 1.2in
Microphone Weight: 270g/ 9.5oz
Package Size: 30 * 18 * 6cm / 11.8 * 7.1 * 2.4in
Package Weight: 810g/ 1.8lbs

Package List:
2 * Microphone
1 * Receiver
2 * Anti-Slip Sleeve
1 * 6.35mm to 3.5mm Adapter
1 * Receiver Charging Cable