Sherlotronics remote transmitters

• Code hopping encryption
• Unique antenna design incorporating the keyring increases operating range by 50%
• Crystal frequency-controlled within +/- 100KHz
• Frequencies available are 403.55MHz and 433.92MHz
• 12V Battery operation - GP23A alkaline cell
• Typically 2 years battery life expected under normal use
• LED flashes when there is a low battery condition
• Rubber buttons are easy to press and click positively