This Shure BLX14 CVL Lavalier System is perfect for presenters and lecturers. It features a lightweight bodypack transmitter, a single-channel tabletop receiver, and a CVL cardioid lav mic. The system has 123 auto-scan frequencies, internal antenna diversity, and runs on 14-hour AA batteries. Expandable to 12 mic channels and a 300' range. The receiver is 7.4 x 1.6 x 4.1' / 188 x 40 x 103 mm, weighs 8.5 oz / 241 g. The transmitter (without batteries) is 2.5 x 4.3 x 0.8' / 64 x 110 x 21 mm, weighs 2.6 oz / 75 g. The microphone is 0.88 oz / 25 g.