The shell treatment with imports UV oil.Range of distance:from 0-7 meters &
transmitter:
43(H)x24.9(W)x11(D)mmweight:8.9gbattery:3v CR2032x1receiver:
59.7(H)x39(W)x16.7(D)mmweight:19.8gbattery:1.5v AAA x 1
The receiver remind themind themind the host by warning tone and vibration if transmitter is away from the receiver .