RE20-15A 15-Channel Touchable Wireless Emitter

Fifteen channels, each can control up to 20 receivers; Power: 3V CR2430 battery; Battery life: over 2 years; Transmit distance: indoor 35 meters; Emitting frequency: 433.92 MHz ± 100 KHz; Emitting power: 10 mW; Operating temperature: -20°C ~ +55°C