another for StealthLock Keyless Cabinet Locking System -LRB- sold separately -RRB-. The transmitter pad -LRB- sold separately -RRB- an inexhaustible number of receiver latches within a 15 foot range using radio frequencies. Programming of the receiver is tardily to do through the transmitter pad. The receiver mounts out of sight within 1/2 '' drawer suspension clearance. four `` AAA '' batteries for operation -LRB- not included -RRB-.