RL RL-3918B Wireless Digital Doorchime Loudly and Clear Voice Easy to Install -No battery

PATENT ENERGY-SAVING TECHNIQUE. 3X LR6 BATTERIES CAN WORK FOR ONE YEAR. BATTRIES FOR REMOTE CONTROL CAN WORK FOR 2 YEARS.

WORKING DISTANCE IS MORE THAN 80 METER.

WATERPROOF REMOTE CONTROL IS LP44 APPROVED.

INTERFERENCE-RESITANT DIGITAL TECHNIQUE.