SMALL SIZE - BIG SOUND for houses of worship, hotels, gyms and band applications The WMS40 Mini Single Vocal Set is a true plugnplay wireless solution providing crystal clear audio sound. The included HT40 Mini handheld transmitter features a dynamic cardioid capsule for maximum gain before feedback. Its extremely long battery life of 30 hours off a single AA battery saves money in day-to-day use. The receiver comes in an ultra compact housing and offers a 1/4" jack output.