ATW-R800 receiver and ATW-T801 UniPak transmitter with omnidirectional lavalier microphone.

Specs

Audio-Technica ATW-T801 UniPak Transmitter Specifications:
• RF Power Output: 10 mW
• Spurious Emissions: Following federal and national regulations
• Input Connections: Four-pin Locking Connector (Pin 1: GND, Pin 2: INST INPUT, Pin 3: MIC INPUT, Pin 4: DC BIAS +9V)
• Batteries: Two 1.5V AA Alkaline (not included)
• Battery Life: 8 hours (alkaline) depending on battery type and use pattern
• Dimensions (W x H x D): 2.76" x 4.08" x 0.98"
• Net Weight: 3.0 oz (without battery)