MC-302 PG2 is a fully supervised two-way magnetic contact transmitter, designed primarily for protecting doors and windows. This highly reliable top-performance wireless device is easy to install and operate in a wide range of residential and commercial environments. It is compatible with PowerMaster® burglar alarm systems. Battery type: 3V, CR-123 Lithium battery. Weight (.including battery): 53g (1.9oz). Operating temperature 0°C to 49°C (32°F to 120°F). Operating environment: Indoor. Dimensions: 81 x 34 x 25 mm.