Piercing alarm voice, strong stainless steel body and key barrel with double locking pin system. A new design of rechargeable battery system will save up not only your money, but also our environment. Twice insertions the lock to your motorcycle disc in 5 seconds could turn off the alarm. Rechargeable Lithium Battery System(3.7V), Weather-Proof Electronics, Alarm Function Selection, Stainless Steel Body, Stainless Steel Key-Barrel, 14mm Double Locking Pin, 100% Preventing Rust, Long Battery Life, Built in 120dB Alarm System